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  Subjects -> MATHEMATICS (Total: 968 journals)
    - APPLIED MATHEMATICS (81 journals)
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    - MATHEMATICS (714 journals)
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MATHEMATICS (714 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 4)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 7)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 15)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 3)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 29)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
Acta Mathematica     Hybrid Journal   (Followers: 12)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 3)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 19)
Advances in Decision Sciences     Open Access   (Followers: 3)
Advances in Difference Equations     Open Access   (Followers: 3)
Advances in Fixed Point Theory     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 3)
Advances in Materials Science     Open Access   (Followers: 14)
Advances in Mathematical Physics     Open Access   (Followers: 4)
Advances in Mathematics     Full-text available via subscription   (Followers: 11)
Advances in Numerical Analysis     Open Access   (Followers: 5)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 6)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 5)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Afrika Matematika     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 11)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 6)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Full-text available via subscription   (Followers: 5)
Algorithms     Open Access   (Followers: 11)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 5)
American Journal of Mathematical Analysis     Open Access  
American Journal of Mathematics     Full-text available via subscription   (Followers: 6)
American Journal of Operations Research     Open Access   (Followers: 5)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 8)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access   (Followers: 1)
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 5)
Analysis Mathematica     Full-text available via subscription  
Analysis. International mathematical journal of analysis and its applications     Hybrid Journal   (Followers: 2)
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 6)
Annals of Mathematics     Full-text available via subscription   (Followers: 1)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12)
Annals of Pure and Applied Logic     Open Access   (Followers: 3)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access  
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1)
Annals of West University of Timisoara - Mathematics     Open Access  
Annuaire du Collège de France     Open Access   (Followers: 5)
ANZIAM Journal     Open Access   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 2)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Mathematics     Open Access   (Followers: 3)
Applied Mathematics     Open Access   (Followers: 7)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 6)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal  
Applied Mathematics Letters     Full-text available via subscription   (Followers: 2)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Armenian Journal of Mathematics     Open Access  
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 20)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Journal of Current Engineering & Maths     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 2)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 6)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 4)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access   (Followers: 1)
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 1)
Basin Research     Hybrid Journal   (Followers: 5)
BIBECHANA     Open Access   (Followers: 2)
BIT Numerical Mathematics     Hybrid Journal  
BoEM - Boletim online de Educação Matemática     Open Access  
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim de Educação Matemática     Open Access  
Boletín de la Sociedad Matemática Mexicana     Hybrid Journal  
Bollettino dell'Unione Matematica Italiana     Full-text available via subscription   (Followers: 1)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 20)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 12)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 4)
Bulletin of Dnipropetrovsk University. Series : Communications in Mathematical Modeling and Differential Equations Theory     Open Access   (Followers: 1)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of Symbolic Logic     Full-text available via subscription   (Followers: 2)
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 1)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 4)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 19)
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Mathematics     Open Access  
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Collectanea Mathematica     Hybrid Journal  
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 8)
Compositio Mathematica     Full-text available via subscription   (Followers: 1)
Comptes Rendus Mathematique     Full-text available via subscription   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 5)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Concrete Operators     Open Access   (Followers: 5)
Confluentes Mathematici     Hybrid Journal  
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal  
Cryptography and Communications     Hybrid Journal   (Followers: 13)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Current Research in Biostatistics     Open Access   (Followers: 9)
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Demographic Research     Open Access   (Followers: 11)
Demonstratio Mathematica     Open Access  
Dependence Modeling     Open Access  
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 29)
Developments in Clay Science     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 3)
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 3)
Differentsial'nye Uravneniya     Open Access  
Discrete Mathematics     Hybrid Journal   (Followers: 8)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae - General Algebra and Applications     Open Access  
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Diskretnaya Matematika     Full-text available via subscription  
Dnipropetrovsk University Mathematics Bulletin     Open Access  
Doklady Akademii Nauk     Open Access  
Doklady Mathematics     Hybrid Journal  
Duke Mathematical Journal     Full-text available via subscription   (Followers: 1)
Eco Matemático     Open Access  
Edited Series on Advances in Nonlinear Science and Complexity     Full-text available via subscription  
Electronic Journal of Combinatorics     Open Access  
Electronic Journal of Differential Equations     Open Access  
Electronic Journal of Graph Theory and Applications     Open Access   (Followers: 2)
Electronic Notes in Discrete Mathematics     Full-text available via subscription   (Followers: 2)
Elemente der Mathematik     Full-text available via subscription   (Followers: 4)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  

        1 2 3 4 | Last

Journal Cover
Axioms
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2075-1680
Published by MDPI Homepage  [203 journals]
  • Axioms, Vol. 7, Pages 20: Graphs in an Intuitionistic Fuzzy Soft
           Environment

    • Authors: Sundas Shahzadi, Muhammad Akram
      First page: 20
      Abstract: In this research article, we present a novel framework for handling intuitionistic fuzzy soft information by combining the theory of intuitionistic fuzzy soft sets with graphs. We introduce the notion of certain types of intuitionistic fuzzy soft graphs including neighbourly edge regular intuitionistic fuzzy soft graphs and strongyl edge irregular intuitionistic fuzzy soft graphs. We illustrate these novel concepts by several examples, and investigate some of their related properties. We present an application of intuitionistic fuzzy soft graph in a decision-making problem and also present our methods as an algorithm that is used in this application.
      Citation: Axioms
      PubDate: 2018-03-23
      DOI: 10.3390/axioms7020020
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 21: Cross Entropy Measures of Bipolar and Interval
           Bipolar Neutrosophic Sets and Their Application for Multi-Attribute
           Decision-Making

    • Authors: Surapati Pramanik, Partha Pratim Dey, Florentin Smarandache, Jun Ye
      First page: 21
      Abstract: The bipolar neutrosophic set is an important extension of the bipolar fuzzy set. The bipolar neutrosophic set is a hybridization of the bipolar fuzzy set and neutrosophic set. Every element of a bipolar neutrosophic set consists of three independent positive membership functions and three independent negative membership functions. In this paper, we develop cross entropy measures of bipolar neutrosophic sets and prove their basic properties. We also define cross entropy measures of interval bipolar neutrosophic sets and prove their basic properties. Thereafter, we develop two novel multi-attribute decision-making strategies based on the proposed cross entropy measures. In the decision-making framework, we calculate the weighted cross entropy measures between each alternative and the ideal alternative to rank the alternatives and choose the best one. We solve two illustrative examples of multi-attribute decision-making problems and compare the obtained result with the results of other existing strategies to show the applicability and effectiveness of the developed strategies. At the end, the main conclusion and future scope of research are summarized.
      Citation: Axioms
      PubDate: 2018-03-24
      DOI: 10.3390/axioms7020021
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 22: Special Numbers and Polynomials Including Their
           Generating Functions in Umbral Analysis Methods

    • Authors: Yilmaz Simsek
      First page: 22
      Abstract: In this paper, by applying umbral calculus methods to generating functions for the combinatorial numbers and the Apostol type polynomials and numbers of order k, we derive some identities and relations including the combinatorial numbers, the Apostol-Bernoulli polynomials and numbers of order k and the Apostol-Euler polynomials and numbers of order k. Moreover, by using p-adic integral technique, we also derive some combinatorial sums including the Bernoulli numbers, the Euler numbers, the Apostol-Euler numbers and the numbers y 1 n , k ; λ . Finally, we make some remarks and observations regarding these identities and relations.
      Citation: Axioms
      PubDate: 2018-04-01
      DOI: 10.3390/axioms7020022
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 23: Interval Neutrosophic Sets with Applications in
           BCK/BCI-Algebra

    • Authors: Young Jun, Seon Kim, Florentin Smarandache
      First page: 23
      Abstract: For i , j , k , l , m , n ∈ { 1 , 2 , 3 , 4 } , the notion of ( T ( i , j ) , I ( k , l ) , F ( m , n ) ) -interval neutrosophic subalgebra in B C K / B C I -algebra is introduced, and their properties and relations are investigated. The notion of interval neutrosophic length of an interval neutrosophic set is also introduced, and related properties are investigated.
      Citation: Axioms
      PubDate: 2018-04-09
      DOI: 10.3390/axioms7020023
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 24: New Definitions about A I -Statistical
           Convergence with Respect to a Sequence of Modulus Functions and Lacunary
           Sequences

    • Authors: Ömer Kişi, Hafize Gümüş, Ekrem Savas
      First page: 24
      Abstract: In this paper, using an infinite matrix of complex numbers, a modulus function and a lacunary sequence, we generalize the concept of I -statistical convergence, which is a recently introduced summability method. The names of our new methods are A I -lacunary statistical convergence and strongly A I -lacunary convergence with respect to a sequence of modulus functions. These spaces are denoted by S θ A I , F and N θ A I , F , respectively. We give some inclusion relations between S A I , F , S θ A I , F and N θ A I , F . We also investigate Cesáro summability for A I and we obtain some basic results between A I -Cesáro summability, strongly A I -Cesáro summability and the spaces mentioned above.
      Citation: Axioms
      PubDate: 2018-04-13
      DOI: 10.3390/axioms7020024
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 25: On the Analysis of Mixed-Index Time Fractional
           Differential Equation Systems

    • Authors: Kevin Burrage, Pamela Burrage, Ian Turner, Fanhai Zeng
      First page: 25
      Abstract: In this paper, we study the class of mixed-index time fractional differential equations in which different components of the problem have different time fractional derivatives on the left-hand side. We prove a theorem on the solution of the linear system of equations, which collapses to the well-known Mittag–Leffler solution in the case that the indices are the same and also generalises the solution of the so-called linear sequential class of time fractional problems. We also investigate the asymptotic stability properties of this class of problems using Laplace transforms and show how Laplace transforms can be used to write solutions as linear combinations of generalised Mittag–Leffler functions in some cases. Finally, we illustrate our results with some numerical simulations.
      Citation: Axioms
      PubDate: 2018-04-17
      DOI: 10.3390/axioms7020025
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 26: Quotient Structures of BCK/BCI-Algebras Induced
           by Quasi-Valuation Maps

    • Authors: Seok-Zun Song, Hashem Bordbar, Young Bae Jun
      First page: 26
      Abstract: Relations between I-quasi-valuation maps and ideals in B C K / B C I -algebras are investigated. Using the notion of an I-quasi-valuation map of a B C K / B C I -algebra, the quasi-metric space is induced, and several properties are investigated. Relations between the I-quasi-valuation map and the I-valuation map are considered, and conditions for an I-quasi-valuation map to be an I-valuation map are provided. A congruence relation is introduced by using the I-valuation map, and then the quotient structures are established and related properties are investigated. Isomorphic quotient B C K / B C I -algebras are discussed.
      Citation: Axioms
      PubDate: 2018-04-23
      DOI: 10.3390/axioms7020026
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 27: Subordination Properties for Multivalent
           Functions Associated with a Generalized Fractional Differintegral Operator
           

    • Authors: Hanaa M. Zayed, Mohamed Kamal Aouf, Adela O. Mostafa
      First page: 27
      Abstract: Using of the principle of subordination, we investigate some subordination and convolution properties for classes of multivalent functions under certain assumptions on the parameters involved, which are defined by a generalized fractional differintegral operator under certain assumptions on the parameters involved.
      Citation: Axioms
      PubDate: 2018-04-24
      DOI: 10.3390/axioms7020027
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 28: Yukawa Potential, Panharmonic Measure and
           Brownian Motion

    • Authors: Antti Rasila, Tommi Sottinen
      First page: 28
      Abstract: This paper continues our earlier investigation, where a walk-on-spheres (WOS) algorithm for Monte Carlo simulation of the solutions of the Yukawa and the Helmholtz partial differential equations (PDEs) was developed by using the Duffin correspondence. In this paper, we investigate the foundations behind the algorithm for the case of the Yukawa PDE. We study the panharmonic measure, which is a generalization of the harmonic measure for the Yukawa PDE. We show that there are natural stochastic definitions for the panharmonic measure in terms of the Brownian motion and that the harmonic and the panharmonic measures are all mutually equivalent. Furthermore, we calculate their Radon–Nikodym derivatives explicitly for some balls, which is a key result behind the WOS algorithm.
      Citation: Axioms
      PubDate: 2018-05-01
      DOI: 10.3390/axioms7020028
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 29: A Survey on the Mathematical Foundations of
           Axiomatic Entropy: Representability and Orderings

    • Authors: María-Jesús Campión, Cristina Gómez-Polo, Esteban Induráin, Armajac Raventós-Pujol
      First page: 29
      Abstract: Different abstract versions of entropy, encountered in science, are interpreted in the light of numerical representations of several ordered structures, as total-preorders, interval-orders and semiorders. Intransitivities, other aspects of entropy as competitive systems, additivity, etc., are also viewed in terms of representability of algebraic structures endowed with some compatible ordering. A particular attention is paid to the problem of the construction of an entropy function or their mathematical equivalents. Multidisciplinary comparisons to other similar frameworks are also discussed, pointing out the mathematical foundations.
      Citation: Axioms
      PubDate: 2018-05-08
      DOI: 10.3390/axioms7020029
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 30: Lyapunov Functions to Caputo Fractional Neural
           Networks with Time-Varying Delays

    • Authors: Ravi Agarwal, Snezhana Hristova, Donal O’Regan
      First page: 30
      Abstract: One of the main properties of solutions of nonlinear Caputo fractional neural networks is stability and often the direct Lyapunov method is used to study stability properties (usually these Lyapunov functions do not depend on the time variable). In connection with the Lyapunov fractional method we present a brief overview of the most popular fractional order derivatives of Lyapunov functions among Caputo fractional delay differential equations. These derivatives are applied to various types of neural networks with variable coefficients and time-varying delays. We show that quadratic Lyapunov functions and their Caputo fractional derivatives are not applicable in some cases when one studies stability properties. Some sufficient conditions for stability of equilibrium of nonlinear Caputo fractional neural networks with time dependent transmission delays, time varying self-regulating parameters of all units and time varying functions of the connection between two neurons in the network are obtained. The cases of time varying Lipschitz coefficients as well as nonLipschitz activation functions are studied. We illustrate our theory on particular nonlinear Caputo fractional neural networks.
      Citation: Axioms
      PubDate: 2018-05-09
      DOI: 10.3390/axioms7020030
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 31: Final Value Problems for Parabolic Differential
           Equations and Their Well-Posedness

    • Authors: Ann-Eva Christensen, Jon Johnsen
      First page: 31
      Abstract: This article concerns the basic understanding of parabolic final value problems, and a large class of such problems is proved to be well posed. The clarification is obtained via explicit Hilbert spaces that characterise the possible data, giving existence, uniqueness and stability of the corresponding solutions. The data space is given as the graph normed domain of an unbounded operator occurring naturally in the theory. It induces a new compatibility condition, which relies on the fact, shown here, that analytic semigroups always are invertible in the class of closed operators. The general set-up is evolution equations for Lax–Milgram operators in spaces of vector distributions. As a main example, the final value problem of the heat equation on a smooth open set is treated, and non-zero Dirichlet data are shown to require a non-trivial extension of the compatibility condition by addition of an improper Bochner integral.
      Citation: Axioms
      PubDate: 2018-05-09
      DOI: 10.3390/axioms7020031
      Issue No: Vol. 7, No. 2 (2018)
       
  • Axioms, Vol. 7, Pages 2: Acknowledgement to Reviewers of Axioms in 2017

    • Authors: Axioms Editorial Office
      First page: 2
      Abstract: Peer review is an essential part in the publication process, ensuring that Axioms maintains high quality standards for its published papers.[...]
      Citation: Axioms
      PubDate: 2018-01-11
      DOI: 10.3390/axioms7010002
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 3: Neutrosophic Positive Implicative N -Ideals in
           BCK-Algebras

    • Authors: Young Jun, Florentin Smarandache, Seok-Zun Song, Madad Khan
      First page: 3
      Abstract: The notion of a neutrosophic positive implicative N -ideal in B C K -algebras is introduced, and several properties are investigated. Relations between a neutrosophic N -ideal and a neutrosophic positive implicative N -ideal are discussed. Characterizations of a neutrosophic positive implicative N -ideal are considered. Conditions for a neutrosophic N -ideal to be a neutrosophic positive implicative N -ideal are provided. An extension property of a neutrosophic positive implicative N -ideal based on the negative indeterminacy membership function is discussed.
      Citation: Axioms
      PubDate: 2018-01-15
      DOI: 10.3390/axioms7010003
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 4: Managing Interacting Criteria: Application to
           Environmental Evaluation Practices

    • Authors: Teresa González-Arteaga, Rocio de Andrés Calle, Luis Martínez
      First page: 4
      Abstract: The need for organizations to evaluate their environmental practices has been recently increasing. This fact has led to the development of many approaches to appraise such practices. In this paper, a novel decision model to evaluate company’s environmental practices is proposed to improve traditional evaluation process in different facets. Firstly, different reviewers’ collectives related to the company’s activity are taken into account in the process to increase company internal efficiency and external legitimacy. Secondly, following the standard ISO 14031, two general categories of environmental performance indicators, management and operational, are considered. Thirdly, since the assumption of independence among environmental indicators is rarely verified in environmental context, an aggregation operator to bear in mind the relationship among such indicators in the evaluation results is proposed. Finally, this new model integrates quantitative and qualitative information with different scales using a multi-granular linguistic model that allows to adapt diverse evaluation scales according to appraisers’ knowledge.
      Citation: Axioms
      PubDate: 2018-01-16
      DOI: 10.3390/axioms7010004
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 5: Rough Neutrosophic Digraphs with Application

    • Authors: Sidra Sayed, Nabeela Ishfaq, Muhammad Akram, Florentin Smarandache
      First page: 5
      Abstract: A rough neutrosophic set model is a hybrid model which deals with vagueness by using the lower and upper approximation spaces. In this research paper, we apply the concept of rough neutrosophic sets to graphs. We introduce rough neutrosophic digraphs and describe methods of their construction. Moreover, we present the concept of self complementary rough neutrosophic digraphs. Finally, we consider an application of rough neutrosophic digraphs in decision-making.
      Citation: Axioms
      PubDate: 2018-01-18
      DOI: 10.3390/axioms7010005
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 6: On Solutions to the Set-Theoretical Yang-Baxter
           Equation in Wajsberg-Algebras

    • Authors: Tahsin Oner, Tugce Katican
      First page: 6
      Abstract: In this work, we introduce Wajsberg algebras which are equivalent structures to MV-algebras in their implicational version, and then we define new notions and give new solutions to the set-theoretical Yang-Baxter equation by using Wajsberg algebras.
      Citation: Axioms
      PubDate: 2018-01-20
      DOI: 10.3390/axioms7010006
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 7: Cubic Interval-Valued Intuitionistic Fuzzy Sets
           and Their Application in BCK/BCI-Algebras

    • Authors: Young Jun, Seok-Zun Song, Seon Kim
      First page: 7
      Abstract: As a new extension of a cubic set, the notion of a cubic interval-valued intuitionistic fuzzy set is introduced, and its application in B C K / B C I -algebra is considered. The notions of α -internal, β -internal, α -external and β -external cubic IVIF set are introduced, and the P-union, P-intersection, R-union and R-intersection of α -internal and α -external cubic IVIF sets are discussed. The concepts of cubic IVIF subalgebra and ideal in B C K / B C I -algebra are introduced, and related properties are investigated. Relations between cubic IVIF subalgebra and cubic IVIF ideal are considered, and characterizations of cubic IVIF subalgebra and cubic IVIF ideal are discussed.
      Citation: Axioms
      PubDate: 2018-01-23
      DOI: 10.3390/axioms7010007
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 8: Fuzzy Analogues of Sets and Functions Can Be
           Uniquely Determined from the Corresponding Ordered Category: A Theorem

    • Authors: Christian Servin, Gerardo Muela, Vladik Kreinovich
      First page: 8
      Abstract: In modern mathematics, many concepts and ideas are described in terms of category theory. From this viewpoint, it is desirable to analyze what can be determined if, instead of the basic category of sets, we consider a similar category of fuzzy sets. In this paper, we describe a natural fuzzy analog of the category of sets and functions, and we show that, in this category, fuzzy relations (a natural fuzzy analogue of functions) can be determined in category terms—of course, modulo 1-1 mapping of the corresponding universe of discourse and 1-1 re-scaling of fuzzy degrees.
      Citation: Axioms
      PubDate: 2018-01-23
      DOI: 10.3390/axioms7010008
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 9: Incentive Compatible Decision Making: Real
           Options with Adverse Incentives

    • Authors: Carlton-James Osakwe
      First page: 9
      Abstract: In this paper, we examine the real options approach to capital budgeting decision making in the presence of managerial adverse incentives. We show that real options have the potential to be value enhancing or value destroying depending on the managerial incentives that may result from having objectives different from firm value maximization. We further examine the possibility of using a generic residual income based rule of managerial compensation to induce the proper investment incentives and we seek to determine the cost-of-capital that must be employed in such a rule. Using numerical examples it is demonstrated that in general, a range of incentive compatible costs-of-capital exists across all managerial investment horizons but not across all managerial hurdle rates.
      Citation: Axioms
      PubDate: 2018-02-07
      DOI: 10.3390/axioms7010009
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 10: Exact Solutions to the Fractional Differential
           Equations with Mixed Partial Derivatives

    • Authors: Jun Jiang, Yuqiang Feng, Shougui Li
      First page: 10
      Abstract: In this paper, the solvability of nonlinear fractional partial differential equations (FPDEs) with mixed partial derivatives is considered. The invariant subspace method is generalized and is then used to derive exact solutions to the nonlinear FPDEs. Some examples are solved to illustrate the effectiveness and applicability of the method.
      Citation: Axioms
      PubDate: 2018-02-11
      DOI: 10.3390/axioms7010010
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 11: A Proposal about the Meaning of Scale, Scope and
           Resolution in the Context of the Information Interpretation Process

    • Authors: Gerardo Febres
      First page: 11
      Abstract: When considering perceptions, the observation scale and resolution are closely related properties. There is consensus on considering resolution as the density of the elementary pieces of information in a specified information space. On the other hand, with the concept of scale, several conceptions compete for a consistent meaning. Scale is typically regarded as a way to indicate the degree of detail in which an observation is performed. Surprisingly, there is not a unified definition of scale as a description’s property. This paper offers a precise definition of scale and a method to quantify it as a property associated with the interpretation of a description. To complete the parameters needed to describe the perception of a description, the concepts of scope and resolution are also revealed with an exact meaning. A model describing a recursive process of interpretation, based on evolving steps of scale, scope and resolution, is introduced. The model relies on the conception of observation scale and its association to the selection of symbols. Five experiments illustrate the application of these concepts, showing that resolution, scale and scope integrate the set of properties to define any point of view from which an observation is performed and interpreted. The results obtained for descriptions expressed in one and two dimensions, are the basis for a comparison of the perceivable symbolic information from different interpretations of the same descriptions. In conclusion, this study provides a framework for building models of our interpretation process and suggests ways to understand some mechanisms in the formation of information from initially meaningless symbols.
      Citation: Axioms
      PubDate: 2018-02-13
      DOI: 10.3390/axioms7010011
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 12: NN-Harmonic Mean Aggregation Operators-Based
           MCGDM Strategy in a Neutrosophic Number Environment

    • Authors: Kalyan Mondal, Surapati Pramanik, Bibhas C. Giri, Florentin Smarandache
      First page: 12
      Abstract: A neutrosophic number (a + bI) is a significant mathematical tool to deal with indeterminate and incomplete information which exists generally in real-world problems, where a and bI denote the determinate component and indeterminate component, respectively. We define score functions and accuracy functions for ranking neutrosophic numbers. We then define a cosine function to determine the unknown weight of the criteria. We define the neutrosophic number harmonic mean operators and prove their basic properties. Then, we develop two novel multi-criteria group decision-making (MCGDM) strategies using the proposed aggregation operators. We solve a numerical example to demonstrate the feasibility, applicability, and effectiveness of the two proposed strategies. Sensitivity analysis with the variation of “I” on neutrosophic numbers is performed to demonstrate how the preference ranking order of alternatives is sensitive to the change of “I”. The efficiency of the developed strategies is ascertained by comparing the results obtained from the proposed strategies with the results obtained from the existing strategies in the literature.
      Citation: Axioms
      PubDate: 2018-02-23
      DOI: 10.3390/axioms7010012
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 13: Neutrosophic Number Nonlinear Programming
           Problems and Their General Solution Methods under Neutrosophic Number
           Environments

    • Authors: Jun Ye, Wenhua Cui, Zhikang Lu
      First page: 13
      Abstract: In practical situations, we often have to handle programming problems involving indeterminate information. Building on the concepts of indeterminacy I and neutrosophic number (NN) (z = p + qI for p, q ∈ ℝ), this paper introduces some basic operations of NNs and concepts of NN nonlinear functions and inequalities. These functions and/or inequalities contain indeterminacy I and naturally lead to a formulation of NN nonlinear programming (NN-NP). These techniques include NN nonlinear optimization models for unconstrained and constrained problems and their general solution methods. Additionally, numerical examples are provided to show the effectiveness of the proposed NN-NP methods. It is obvious that the NN-NP problems usually yield NN optimal solutions, but not always. The possible optimal ranges of the decision variables and NN objective function are indicated when the indeterminacy I is considered for possible interval ranges in real situations.
      Citation: Axioms
      PubDate: 2018-02-24
      DOI: 10.3390/axioms7010013
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 14: Neutrosophic Soft Rough Graphs with Application

    • Authors: Muhammad Akram, Hafsa M. Malik, Sundas Shahzadi, Florentin Smarandache
      First page: 14
      Abstract: Neutrosophic sets (NSs) handle uncertain information while fuzzy sets (FSs) and intuitionistic fuzzy sets (IFs) fail to handle indeterminate information. Soft set theory, neutrosophic set theory, and rough set theory are different mathematical models for handling uncertainties and they are mutually related. The neutrosophic soft rough set (NSRS) model is a hybrid model by combining neutrosophic soft sets with rough sets. We apply neutrosophic soft rough sets to graphs. In this research paper, we introduce the idea of neutrosophic soft rough graphs (NSRGs) and describe different methods of their construction. We consider the application of NSRG in decision-making problems. In particular, we develop efficient algorithms to solve decision-making problems.
      Citation: Axioms
      PubDate: 2018-02-26
      DOI: 10.3390/axioms7010014
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 15: On Transcendental Numbers: New Results and a
           Little History

    • Authors: Solomon Marcus, Florin Nichita
      First page: 15
      Abstract: Bringing toghether mathematical and philosophical ideas related to transcendental numbers, this paper begins with a survey on transcendence and transcendental numbers, it then presents several properties of the transcendental numbers e and π , and then it gives the proof of a new inequality for transcendental numbers. Also, in relationship with these topics, we study solutions to the Yang-Baxter equation from hyperbolic functions and from logical implication.
      Citation: Axioms
      PubDate: 2018-03-01
      DOI: 10.3390/axioms7010015
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 16: Revision of the Kosiński’s Theory of
           Ordered Fuzzy Numbers

    • Authors: Krzysztof Piasecki
      First page: 16
      Abstract: Ordered fuzzy numbers are defined by Kosiński. In this way, he was going to supplement a fuzzy number by orientation. A significant drawback of Kosiński’s theory is that there exist such ordered fuzzy numbers which, in fact, are not fuzzy numbers. For this reason, a fully formalized correct definition of ordered fuzzy numbers is proposed here. Also, the arithmetic proposed by Kosiński has a significant disadvantage. The space of ordered fuzzy numbers is not closed under Kosiński’s addition. On the other hand, many mathematical applications require the considered space be closed under used arithmetic operations. Therefore, the Kosinski’s theory is modified in this way that the space of ordered fuzzy numbers is closed under revised arithmetic operations. In addition, it is shown that the multiple revised sum of finite sequence of ordered fuzzy numbers depends on its summands ordering.
      Citation: Axioms
      PubDate: 2018-03-02
      DOI: 10.3390/axioms7010016
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 17: An Abstract Result on Projective Aggregation
           Functions

    • Authors: Juan Candeal
      First page: 17
      Abstract: A general characterization result of projective aggregation functions is shown, the proof of which makes use of the celebrated Arrow’s theorem, thus providing a link between aggregation functions theory and social choice theory. The result can be viewed as a generalization of a theorem obtained by Kim (1990) for real-valued aggregation functions defined on the n-dimensional Euclidean space in the context of measurement theory. In addition, two applications of the core theorem of the article are shown. The first is a simple extension of the main result to the context of multi-valued aggregation functions. The second offers a new characterization of projective bijection aggregators, thus connecting aggregation operators theory with social choice.
      Citation: Axioms
      PubDate: 2018-03-20
      DOI: 10.3390/axioms7010017
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 18: A Type of the Shadowing Properties for Generic
           View Points

    • Authors: Manseob Lee
      First page: 18
      Abstract: We show that if a C 1 generic diffeomorphism of a closed smooth two-dimensional manifold has the average shadowing property or the asymptotic average shadowing property, then it is Anosov. Moreover, if a C 1 generic vector field of a closed smooth three-dimensional manifold has the average shadowing property or the asymptotic average shadowing property, then it satisfies singular Axiom A without cycles.
      Citation: Axioms
      PubDate: 2018-03-20
      DOI: 10.3390/axioms7010018
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 19: Multi-Attribute Decision-Making Method Based on
           Neutrosophic Soft Rough Information

    • Authors: Muhammad Akram, Sundas Shahzadi, Florentin Smarandache
      First page: 19
      Abstract: Soft sets (SSs), neutrosophic sets (NSs), and rough sets (RSs) are different mathematical models for handling uncertainties, but they are mutually related. In this research paper, we introduce the notions of soft rough neutrosophic sets (SRNSs) and neutrosophic soft rough sets (NSRSs) as hybrid models for soft computing. We describe a mathematical approach to handle decision-making problems in view of NSRSs. We also present an efficient algorithm of our proposed hybrid model to solve decision-making problems.
      Citation: Axioms
      PubDate: 2018-03-20
      DOI: 10.3390/axioms7010019
      Issue No: Vol. 7, No. 1 (2018)
       
  • Axioms, Vol. 7, Pages 1: A Fuzzy Trade-Off Ranking Method for
           Multi-Criteria Decision-Making

    • Authors: Nor Jaini, Sergey Utyuzhnikov
      First page: 1
      Abstract: The aim of this paper is to present a trade-off ranking method in a fuzzy multi-criteria decision-making environment. The triangular fuzzy numbers are used to represent the imprecise numerical quantities in the criteria values of each alternative and the weight of each criterion. A fuzzy trade-off ranking method is developed to rank alternatives in the fuzzy multi-criteria decision-making problem with conflicting criteria. The trade-off ranking method tackles this type of multi-criteria problems by giving the least compromise solution as the best option. The proposed method for the fuzzy decision-making problems is compared against two other fuzzy decision-making approaches, fuzzy Technique for Order Preference by Similarity to the Ideal Solution (TOPSIS) and fuzzy VlseKriterijuska Optimizacija I Komoromisno Resenje (VIKOR), used for ranking alternatives.
      Citation: Axioms
      PubDate: 2017-12-26
      DOI: 10.3390/axioms7010001
      Issue No: Vol. 7, No. 1 (2017)
       
  • Axioms, Vol. 6, Pages 27: Computing the Scale of an Endomorphism of a
           totally Disconnected Locally Compact Group

    • Authors: George Willis
      First page: 27
      Abstract: The scale of an endomorphism of a totally disconnected, locally compact group G is defined and an example is presented which shows that the scale function is not always continuous with respect to the Braconnier topology on the automorphism group of G. Methods for computing the scale, which is a positive integer, are surveyed and illustrated by applying them in diverse cases, including when G is compact; an automorphism group of a tree; Neretin’s group of almost automorphisms of a tree; and a p-adic Lie group. The information required to compute the scale is reviewed from the perspective of the, as yet incomplete, general theory of totally disconnected, locally compact groups.
      Citation: Axioms
      PubDate: 2017-10-20
      DOI: 10.3390/axioms6040027
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 28: Large Sets in Boolean and Non-Boolean Groups and
           Topology

    • Authors: Ol’ga Sipacheva
      First page: 28
      Abstract: Various notions of large sets in groups, including the classical notions of thick, syndetic, and piecewise syndetic sets and the new notion of vast sets in groups, are studied with emphasis on the interplay between such sets in Boolean groups. Natural topologies closely related to vast sets are considered; as a byproduct, interesting relations between vast sets and ultrafilters are revealed.
      Citation: Axioms
      PubDate: 2017-10-24
      DOI: 10.3390/axioms6040028
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 29: Existence of Order-Preserving Functions for
           Nontotal Fuzzy Preference Relations under Decisiveness

    • Authors: Paolo Bevilacqua, Gianni Bosi, Magalì Zuanon
      First page: 29
      Abstract: Looking at decisiveness as crucial, we discuss the existence of an order-preserving function for the nontotal crisp preference relation naturally associated to a nontotal fuzzy preference relation. We further present conditions for the existence of an upper semicontinuous order-preserving function for a fuzzy binary relation on a crisp topological space.
      Citation: Axioms
      PubDate: 2017-10-28
      DOI: 10.3390/axioms6040029
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 30: Mild Solutions to the Cauchy Problem for Some
           Fractional Differential Equations with Delay

    • Authors: Jin Liang, Yunyi Mu
      First page: 30
      Abstract: In this paper, we present new existence theorems of mild solutions to Cauchy problem for some fractional differential equations with delay. Our main tools to obtain our results are the theory of analytic semigroups and compact semigroups, the Kuratowski measure of non-compactness, and fixed point theorems, with the help of some estimations. Examples are also given to illustrate the applicability of our results.
      Citation: Axioms
      PubDate: 2017-11-20
      DOI: 10.3390/axioms6040030
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 31: A Dynamic Ticket Pricing Approach for Soccer
           Games

    • Authors: Mehmet Şahin, Rızvan Erol
      First page: 31
      Abstract: This study proposes a mathematical model of dynamic pricing for soccer game tickets. The logic behind the dynamic ticket pricing model is price change based on multipliers which reflect the effects of time and inventory. Functions are formed for the time and inventory multipliers. The optimization algorithm attempts to find optimal values of these multipliers in order to maximize revenue. By multiplying the mean season ticket price (used as the reference price) by the multipliers, dynamic ticket prices are obtained. Demand rates at different prices are needed for the model, and they are provided by a unique fuzzy logic model. The results of this model are compared with real data to test the model’s effectiveness. According to the results of the dynamic pricing model, the total revenue generated is increased by 8.95% and 0.76% compared with the static pricing strategy in the first and second cases, respectively. The results of the fuzzy logic model are also found to be competitive and effective. This is the first time a fuzzy logic model has been designed to forecast the attendance of soccer games. It is also the first time this type of mathematical model of dynamic pricing for soccer game tickets has been designed.
      Citation: Axioms
      PubDate: 2017-11-19
      DOI: 10.3390/axioms6040031
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 32: Factorization of Graded Traces on Nichols
           Algebras

    • Authors: Simon Lentner, Andreas Lochmann
      First page: 32
      Abstract: A ubiquitous observation for finite-dimensional Nichols algebras is that as a graded algebra the Hilbert series factorizes into cyclotomic polynomials. For Nichols algebras of diagonal type (e.g., Borel parts of quantum groups), this is a consequence of the existence of a root system and a Poincare-Birkhoff-Witt (PBW) basis basis, but, for nondiagonal examples (e.g., Fomin–Kirillov algebras), this is an ongoing surprise. In this article, we discuss this phenomenon and observe that it continues to hold for the graded character of the involved group and for automorphisms. First, we discuss thoroughly the diagonal case. Then, we prove factorization for a large class of nondiagonal Nichols algebras obtained by the folding construction. We conclude empirically by listing all remaining examples, which were in size accessible to the computer algebra system GAP and find that again all graded characters factorize.
      Citation: Axioms
      PubDate: 2017-12-04
      DOI: 10.3390/axioms6040032
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 33: Universal Enveloping Commutative Rota–Baxter
           Algebras of Pre- and Post-Commutative Algebras

    • Authors: Vsevolod Gubarev
      First page: 33
      Abstract: Universal enveloping commutative Rota–Baxter algebras of pre- and post-commutative algebras are constructed. The pair of varieties (RBλCom, postCom) is proved to be a Poincaré–Birkhoff–Witt-pair (PBW)-pair and the pair (RBCom, preCom) is proven not to be.
      Citation: Axioms
      PubDate: 2017-12-07
      DOI: 10.3390/axioms6040033
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 34: On Indistinguishability Operators, Fuzzy Metrics
           and Modular Metrics

    • Authors: Juan-José Miñana, Oscar Valero
      First page: 34
      Abstract: The notion of indistinguishability operator was introduced by Trillas, E. in 1982, with the aim of fuzzifying the crisp notion of equivalence relation. Such operators allow for measuring the similarity between objects when there is a limitation on the accuracy of the performed measurement or a certain degree of similarity can be only determined between the objects being compared. Since Trillas introduced such kind of operators, many authors have studied their properties and applications. In particular, an intensive research line is focused on the metric behavior of indistinguishability operators. Specifically, the existence of a duality between metrics and indistinguishability operators has been explored. In this direction, a technique to generate metrics from indistinguishability operators, and vice versa, has been developed by several authors in the literature. Nowadays, such a measurement of similarity is provided by the so-called fuzzy metrics when the degree of similarity between objects is measured relative to a parameter. The main purpose of this paper is to extend the notion of indistinguishability operator in such a way that the measurements of similarity are relative to a parameter and, thus, classical indistinguishability operators and fuzzy metrics can be retrieved as a particular case. Moreover, we discuss the relationship between the new operators and metrics. Concretely, we prove the existence of a duality between them and the so-called modular metrics, which provide a dissimilarity measurement between objects relative to a parameter. The new duality relationship allows us, on the one hand, to introduce a technique for generating the new indistinguishability operators from modular metrics and vice versa and, on the other hand, to derive, as a consequence, a technique for generating fuzzy metrics from modular metrics and vice versa. Furthermore, we yield examples that illustrate the new results.
      Citation: Axioms
      PubDate: 2017-12-15
      DOI: 10.3390/axioms6040034
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 35: Neutrosophic Hough Transform

    • Authors: Ümit Budak, Yanhui Guo, Abdulkadir Şengür, Florentin Smarandache
      First page: 35
      Abstract: Hough transform (HT) is a useful tool for both pattern recognition and image processing communities. In the view of pattern recognition, it can extract unique features for description of various shapes, such as lines, circles, ellipses, and etc. In the view of image processing, a dozen of applications can be handled with HT, such as lane detection for autonomous cars, blood cell detection in microscope images, and so on. As HT is a straight forward shape detector in a given image, its shape detection ability is low in noisy images. To alleviate its weakness on noisy images and improve its shape detection performance, in this paper, we proposed neutrosophic Hough transform (NHT). As it was proved earlier, neutrosophy theory based image processing applications were successful in noisy environments. To this end, the Hough space is initially transferred into the NS domain by calculating the NS membership triples (T, I, and F). An indeterminacy filtering is constructed where the neighborhood information is used in order to remove the indeterminacy in the spatial neighborhood of neutrosophic Hough space. The potential peaks are detected based on thresholding on the neutrosophic Hough space, and these peak locations are then used to detect the lines in the image domain. Extensive experiments on noisy and noise-free images are performed in order to show the efficiency of the proposed NHT algorithm. We also compared our proposed NHT with traditional HT and fuzzy HT methods on variety of images. The obtained results showed the efficiency of the proposed NHT on noisy images.
      Citation: Axioms
      PubDate: 2017-12-18
      DOI: 10.3390/axioms6040035
      Issue No: Vol. 6, No. 4 (2017)
       
  • Axioms, Vol. 6, Pages 17: An Independent Set of Axioms of MV-Algebras and
           Solutions of the Set-Theoretical Yang–Baxter Equation

    • Authors: Tahsin Oner, Ibrahim Senturk, Gulsah Oner
      First page: 17
      Abstract: The aim of this paper is to give a new equivalent set of axioms for MV-algebras, and to show that the axioms are independent. In addition to this, we handle Yang–Baxter equation problem. In conclusion, we construct a new set-theoretical solution for the Yang–Baxter equation by using MV-algebras.
      Citation: Axioms
      PubDate: 2017-06-22
      DOI: 10.3390/axioms6030017
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 18: Fractional Integration and Differentiation of
           the Generalized Mathieu Series

    • Authors: Ram Saxena, Rakesh Parmar
      First page: 18
      Abstract: We aim to present some formulas for the Saigo hypergeometric fractional integral and differential operators involving the generalized Mathieu series S μ ( r ) , which are expressed in terms of the Hadamard product of the generalized Mathieu series S μ ( r ) and the Fox–Wright function p Ψ q ( z ) . Corresponding assertions for the classical Riemann–Liouville and Erdélyi–Kober fractional integral and differential operators are deduced. Further, it is emphasized that the results presented here, which are for a seemingly complicated series, can reveal their involved properties via the series of the two known functions.
      Citation: Axioms
      PubDate: 2017-06-27
      DOI: 10.3390/axioms6030018
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 19: Assigning Numerical Scores to Linguistic
           Expressions

    • Authors: María Campión, Edurne Falcó, José García-Lapresta, Esteban Induráin
      First page: 19
      Abstract: In this paper, we study different methods of scoring linguistic expressions defined on a finite set, in the search for a linear order that ranks all those possible expressions. Among them, particular attention is paid to the canonical extension, and its representability through distances in a graph plus some suitable penalization of imprecision. The relationship between this setting and the classical problems of numerical representability of orderings, as well as extension of orderings from a set to a superset is also explored. Finally, aggregation procedures of qualitative rankings and scorings are also analyzed.
      Citation: Axioms
      PubDate: 2017-07-06
      DOI: 10.3390/axioms6030019
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 20: Quincunx Fundamental Refinable Functions in
           Arbitrary Dimensions

    • Authors: Xiaosheng Zhuang
      First page: 20
      Abstract: In this paper, we generalize the family of Deslauriers–Dubuc’s interpolatory masks from dimension one to arbitrary dimensions with respect to the quincunx dilation matrices, thereby providing a family of quincunx fundamental refinable functions in arbitrary dimensions. We show that a family of unique quincunx interpolatory masks exists and such a family of masks is of real value and has the full-axis symmetry property. In dimension d = 2 , we give the explicit form of such unique quincunx interpolatory masks, which implies the nonnegativity property of such a family of masks.
      Citation: Axioms
      PubDate: 2017-07-06
      DOI: 10.3390/axioms6030020
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 21: The SIC Question: History and State of Play

    • Authors: Christopher Fuchs, Michael Hoang, Blake Stacey
      First page: 21
      Abstract: Recent years have seen significant advances in the study of symmetric informationally complete (SIC) quantum measurements, also known as maximal sets of complex equiangular lines. Previously, the published record contained solutions up to dimension 67, and was with high confidence complete up through dimension 50. Computer calculations have now furnished solutions in all dimensions up to 151, and in several cases beyond that, as large as dimension 844. These new solutions exhibit an additional type of symmetry beyond the basic definition of a SIC, and so verify a conjecture of Zauner in many new cases. The solutions in dimensions 68 through 121 were obtained by Andrew Scott, and his catalogue of distinct solutions is, with high confidence, complete up to dimension 90. Additional results in dimensions 122 through 151 were calculated by the authors using Scott’s code. We recap the history of the problem, outline how the numerical searches were done, and pose some conjectures on how the search technique could be improved. In order to facilitate communication across disciplinary boundaries, we also present a comprehensive bibliography of SIC research.
      Citation: Axioms
      PubDate: 2017-07-18
      DOI: 10.3390/axioms6030021
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 22: New Order on Type 2 Fuzzy Numbers

    • Authors: Pablo Hernández, Susana Cubillo, Carmen Torres-Blanc, José Guerrero
      First page: 22
      Abstract: Since Lotfi A. Zadeh introduced the concept of fuzzy sets in 1965, many authors have devoted their efforts to the study of these new sets, both from a theoretical and applied point of view. Fuzzy sets were later extended in order to get more adequate and flexible models of inference processes, where uncertainty, imprecision or vagueness is present. Type 2 fuzzy sets comprise one of such extensions. In this paper, we introduce and study an extension of the fuzzy numbers (type 1), the type 2 generalized fuzzy numbers and type 2 fuzzy numbers. Moreover, we also define a partial order on these sets, which extends into these sets the usual order on real numbers, which undoubtedly becomes a new option to be taken into account in the existing total preorders for ranking interval type 2 fuzzy numbers, which are a subset of type 2 generalized fuzzy numbers.
      Citation: Axioms
      PubDate: 2017-07-28
      DOI: 10.3390/axioms6030022
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 23: Categorically Closed Topological Groups

    • Authors: Taras Banakh
      First page: 23
      Abstract: Let C → be a category whose objects are semigroups with topology and morphisms are closed semigroup relations, in particular, continuous homomorphisms. An object X of the category C → is called C → -closed if for each morphism Φ ⊂ X × Y in the category C → the image Φ ( X ) = { y ∈ Y : ∃ x ∈ X ( x , y ) ∈ Φ } is closed in Y. In the paper we survey existing and new results on topological groups, which are C → -closed for various categories C → of topologized semigroups.
      Citation: Axioms
      PubDate: 2017-07-30
      DOI: 10.3390/axioms6030023
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 24: Topological Signals of Singularities in Ricci
           Flow

    • Authors: Paul Alsing, Howard Blair, Matthew Corne, Gordon Jones, Warner Miller, Konstantin Mischaikow, Vidit Nanda
      First page: 24
      Abstract: We implement methods from computational homology to obtain a topological signal of singularity formation in a selection of geometries evolved numerically by Ricci flow. Our approach, based on persistent homology, produces precise, quantitative measures describing the behavior of an entire collection of data across a discrete sample of times. We analyze the topological signals of geometric criticality obtained numerically from the application of persistent homology to models manifesting singularities under Ricci flow. The results we obtain for these numerical models suggest that the topological signals distinguish global singularity formation (collapse to a round point) from local singularity formation (neckpinch). Finally, we discuss the interpretation and implication of these results and future applications.
      Citation: Axioms
      PubDate: 2017-08-01
      DOI: 10.3390/axioms6030024
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 25: Orness For Idempotent Aggregation Functions

    • Authors: Leire Legarreta, Inmaculada Lizasoain, Iraide Mardones-Pérez
      First page: 25
      Abstract: Aggregation functions are mathematical operators that merge given data in order to obtain a global value that preserves the information given by the data as much as possible. In most practical applications, this value is expected to be between the infimum and the supremum of the given data, which is guaranteed only when the aggregation functions are idempotent. Ordered weighted averaging (OWA) operators are particular cases of this kind of function, with the particularity that the obtained global value depends on neither the source nor the expert that provides each datum, but only on the set of values. They have been classified by means of the orness—a measurement of the proximity of an OWA operator to the OR-operator. In this paper, the concept of orness is extended to the framework of idempotent aggregation functions defined both on the real unit interval and on a complete lattice with a local finiteness condition.
      Citation: Axioms
      PubDate: 2017-09-20
      DOI: 10.3390/axioms6030025
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 26: From Normal Surfaces to Normal Curves to
           Geodesics on Surfaces

    • Authors: Eli Appleboim
      First page: 26
      Abstract: This paper gives a study of a two dimensional version of the theory of normal surfaces; namely, a study o normal curves and their relations with respect to geodesic curves. This study results with a nice discrete approximation of geodesics embedded in a triangulated orientable Riemannian surface. Experimental results of the two dimensional case are given as well.
      Citation: Axioms
      PubDate: 2017-09-20
      DOI: 10.3390/axioms6030026
      Issue No: Vol. 6, No. 3 (2017)
       
  • Axioms, Vol. 6, Pages 7: Fourier Series for Singular Measures

    • Authors: John Herr, Eric Weber
      First page: 7
      Abstract: Using the Kaczmarz algorithm, we prove that for any singular Borel probability measure μ on [ 0 , 1 ) , every f ∈ L 2 ( μ ) possesses a Fourier series of the form f ( x ) = ∑ n = 0 ∞ c n e 2 π i n x . We show that the coefficients c n can be computed in terms of the quantities f ^ ( n ) = ∫ 0 1 f ( x ) e − 2 π i n x d μ ( x ) . We also demonstrate a Shannon-type sampling theorem for functions that are in a sense μ -bandlimited.
      Citation: Axioms
      PubDate: 2017-03-28
      DOI: 10.3390/axioms6020007
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 8: Expansion of the Kullback-Leibler Divergence, and
           a New Class of Information Metrics

    • Authors: David Galas, Gregory Dewey, James Kunert-Graf, Nikita Sakhanenko
      First page: 8
      Abstract: Inferring and comparing complex, multivariable probability density functions is fundamental to problems in several fields, including probabilistic learning, network theory, and data analysis. Classification and prediction are the two faces of this class of problem. This study takes an approach that simplifies many aspects of these problems by presenting a structured, series expansion of the Kullback-Leibler divergence—a function central to information theory—and devise a distance metric based on this divergence. Using the Möbius inversion duality between multivariable entropies and multivariable interaction information, we express the divergence as an additive series in the number of interacting variables, which provides a restricted and simplified set of distributions to use as approximation and with which to model data. Truncations of this series yield approximations based on the number of interacting variables. The first few terms of the expansion-truncation are illustrated and shown to lead naturally to familiar approximations, including the well-known Kirkwood superposition approximation. Truncation can also induce a simple relation between the multi-information and the interaction information. A measure of distance between distributions, based on Kullback-Leibler divergence, is then described and shown to be a true metric if properly restricted. The expansion is shown to generate a hierarchy of metrics and connects this work to information geometry formalisms. An example of the application of these metrics to a graph comparison problem is given that shows that the formalism can be applied to a wide range of network problems and provides a general approach for systematic approximations in numbers of interactions or connections, as well as a related quantitative metric.
      Citation: Axioms
      PubDate: 2017-04-01
      DOI: 10.3390/axioms6020008
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 9: Euclidean Algorithm for Extension of Symmetric
           Laurent Polynomial Matrix and Its Application in Construction of Multiband
           Symmetric Perfect Reconstruction Filter Bank

    • Authors: Jianzhong Wang
      First page: 9
      Abstract: For a given pair of s-dimensional real Laurent polynomials ( a → ( z ) , b → ( z ) ) , which has a certain type of symmetry and satisfies the dual condition b → ( z ) T a → ( z ) = 1 , an s × s Laurent polynomial matrix A ( z ) (together with its inverse A - 1 ( z ) ) is called a symmetric Laurent polynomial matrix extension of the dual pair ( a → ( z ) , b → ( z ) ) if A ( z ) has similar symmetry, the inverse A - 1 ( Z ) also is a Laurent polynomial matrix, the first column of A ( z ) is a → ( z ) and the first row of A - 1 ( z ) is ( b → ( z ) ) T . In this paper, we introduce the Euclidean symmetric division and the symmetric elementary matrices in the Laurent polynomial ring and reveal their relation. Based on the Euclidean symmetric division algorithm in the Laurent polynomial ring, we develop a novel and effective algorithm for symmetric Laurent polynomial matrix extension. We also apply the algorithm in the construction of multi-band symmetric perfect reconstruction filter banks.
      Citation: Axioms
      PubDate: 2017-04-20
      DOI: 10.3390/axioms6020009
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 10: Orientation Asymmetric Surface Model for
           Membranes: Finsler Geometry Modeling

    • Authors: Evgenii Proutorov, Hiroshi Koibuchi
      First page: 10
      Abstract: We study triangulated surface models with nontrivial surface metrices for membranes. The surface model is defined by a mapping r from a two-dimensional parameter space M to the three-dimensional Euclidean space R 3 . The metric variable g a b , which is always fixed to the Euclidean metric δ a b , can be extended to a more general non-Euclidean metric on M in the continuous model. The problem we focus on in this paper is whether such an extension is well defined or not in the discrete model. We find that a discrete surface model with a nontrivial metric becomes well defined if it is treated in the context of Finsler geometry (FG) modeling, where triangle edge length in M depends on the direction. It is also shown that the discrete FG model is orientation asymmetric on invertible surfaces in general, and for this reason, the FG model has a potential advantage for describing real physical membranes, which are expected to have some asymmetries for orientation-changing transformations.
      Citation: Axioms
      PubDate: 2017-04-25
      DOI: 10.3390/axioms6020010
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 11: Multivariate Extended Gamma Distribution

    • Authors: Dhannya Joseph
      First page: 11
      Abstract: In this paper, I consider multivariate analogues of the extended gamma density, which will provide multivariate extensions to Tsallis statistics and superstatistics. By making use of the pathway parameter β , multivariate generalized gamma density can be obtained from the model considered here. Some of its special cases and limiting cases are also mentioned. Conditional density, best predictor function, regression theory, etc., connected with this model are also introduced.
      Citation: Axioms
      PubDate: 2017-04-24
      DOI: 10.3390/axioms6020011
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 12: Toward Measuring Network Aesthetics Based on
           Symmetry

    • Authors: Zengqiang Chen, Matthias Dehmer, Frank Emmert-Streib, Abbe Mowshowitz, Yongtang Shi
      First page: 12
      Abstract: In this exploratory paper, we discuss quantitative graph-theoretical measures of network aesthetics. Related work in this area has typically focused on geometrical features (e.g., line crossings or edge bendiness) of drawings or visual representations of graphs which purportedly affect an observer’s perception. Here we take a very different approach, abandoning reliance on geometrical properties, and apply information-theoretic measures to abstract graphs and networks directly (rather than to their visual representaions) as a means of capturing classical appreciation of structural symmetry. Examples are used solely to motivate the approach to measurement, and to elucidate our symmetry-based mathematical theory of network aesthetics.
      Citation: Axioms
      PubDate: 2017-05-06
      DOI: 10.3390/axioms6020012
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 13: No Uncountable Polish Group Can be a
           Right-Angled Artin Group

    • Authors: Gianluca Paolini, Saharon Shelah
      First page: 13
      Abstract: We prove that if G is a Polish group and A a group admitting a system of generators whose associated length function satisfies: (i) if 0 < k < ω , then l g ( x ) ≤ l g ( x k ) ; (ii) if l g ( y ) < k < ω and x k = y , then x = e , then there exists a subgroup G * of G of size b (the bounding number) such that G * is not embeddable in A. In particular, we prove that the automorphism group of a countable structure cannot be an uncountable right-angled Artin group. This generalizes analogous results for free and free abelian uncountable groups.
      Citation: Axioms
      PubDate: 2017-05-11
      DOI: 10.3390/axioms6020013
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 14: Tsallis Entropy and Generalized Shannon
           Additivity

    • Authors: Sonja Jäckle, Karsten Keller
      First page: 14
      Abstract: The Tsallis entropy given for a positive parameter α can be considered as a generalization of the classical Shannon entropy. For the latter, corresponding to α = 1 , there exist many axiomatic characterizations. One of them based on the well-known Khinchin-Shannon axioms has been simplified several times and adapted to Tsallis entropy, where the axiom of (generalized) Shannon additivity is playing a central role. The main aim of this paper is to discuss this axiom in the context of Tsallis entropy. We show that it is sufficient for characterizing Tsallis entropy, with the exceptions of cases α = 1 , 2 discussed separately.
      Citation: Axioms
      PubDate: 2017-06-14
      DOI: 10.3390/axioms6020014
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 15: Scalable and Fully Distributed Localization in
           Large-Scale Sensor Networks

    • Authors: Miao Jin, Su Xia, Hongyi Wu, Xianfeng Gu
      First page: 15
      Abstract: This work proposes a novel connectivity-based localization algorithm, well suitable for large-scale sensor networks with complex shapes and a non-uniform nodal distribution. In contrast to current state-of-the-art connectivity-based localization methods, the proposed algorithm is highly scalable with linear computation and communication costs with respect to the size of the network; and fully distributed where each node only needs the information of its neighbors without cumbersome partitioning and merging process. The algorithm is theoretically guaranteed and numerically stable. Moreover, the algorithm can be readily extended to the localization of networks with a one-hop transmission range distance measurement, and the propagation of the measurement error at one sensor node is limited within a small area of the network around the node. Extensive simulations and comparison with other methods under various representative network settings are carried out, showing the superior performance of the proposed algorithm.
      Citation: Axioms
      PubDate: 2017-06-15
      DOI: 10.3390/axioms6020015
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 16: An Evaluation of ARFIMA (Autoregressive
           Fractional Integral Moving Average) Programs

    • Authors: Kai Liu, YangQuan Chen, Xi Zhang
      First page: 16
      Abstract: Strong coupling between values at different times that exhibit properties of long range dependence, non-stationary, spiky signals cannot be processed by the conventional time series analysis. The autoregressive fractional integral moving average (ARFIMA) model, a fractional order signal processing technique, is the generalization of the conventional integer order models—autoregressive integral moving average (ARIMA) and autoregressive moving average (ARMA) model. Therefore, it has much wider applications since it could capture both short-range dependence and long range dependence. For now, several software programs have been developed to deal with ARFIMA processes. However, it is unfortunate to see that using different numerical tools for time series analysis usually gives quite different and sometimes radically different results. Users are often puzzled about which tool is suitable for a specific application. We performed a comprehensive survey and evaluation of available ARFIMA tools in the literature in the hope of benefiting researchers with different academic backgrounds. In this paper, four aspects of ARFIMA programs concerning simulation, fractional order difference filter, estimation and forecast are compared and evaluated, respectively, in various software platforms. Our informative comments can serve as useful selection guidelines.
      Citation: Axioms
      PubDate: 2017-06-17
      DOI: 10.3390/axioms6020016
      Issue No: Vol. 6, No. 2 (2017)
       
  • Axioms, Vol. 6, Pages 1: Cuntz Semigroups of Compact-Type Hopf C*-Algebras

    • Authors: Dan Kučerovský
      First page: 1
      Abstract: The classical Cuntz semigroup has an important role in the study of C*-algebras, being one of the main invariants used to classify recalcitrant C*-algebras up to isomorphism. We consider C*-algebras that have Hopf algebra structure, and find additional structure in their Cuntz semigroups. We show that in many cases, isomorphisms of Cuntz semigroups that respect this additional structure can be lifted to Hopf algebra (bi)isomorphisms, up to a possible flip of the co-product. This shows that the Cuntz semigroup provides an interesting invariant of C*-algebraic quantum groups.
      Citation: Axioms
      PubDate: 2017-01-04
      DOI: 10.3390/axioms6010001
      Issue No: Vol. 6, No. 1 (2017)
       
  • Axioms, Vol. 6, Pages 2: Acknowledgement to Reviewers of Axioms in 2016

    • Authors: Axioms Editorial Office
      First page: 2
      Abstract: n/a
      Citation: Axioms
      PubDate: 2017-01-11
      DOI: 10.3390/axioms6010002
      Issue No: Vol. 6, No. 1 (2017)
       
  • Axioms, Vol. 6, Pages 3: Discrete Frames on Finite Dimensional Left
           Quaternion Hilbert Spaces

    • Authors: M. Khokulan, K. Thirulogasanthar, S. Srisatkunarajah
      First page: 3
      Abstract: An introductory theory of frames on finite dimensional left quaternion Hilbert spaces is demonstrated along the lines of their complex counterpart.
      Citation: Axioms
      PubDate: 2017-02-21
      DOI: 10.3390/axioms6010003
      Issue No: Vol. 6, No. 1 (2017)
       
  • Axioms, Vol. 6, Pages 4: Sparse Wavelet Representation of Differential
           Operators with Piecewise Polynomial Coefficients

    • Authors: Dana Černá, Václav Finĕk
      First page: 4
      Abstract: We propose a construction of a Hermite cubic spline-wavelet basis on the interval and hypercube. The basis is adapted to homogeneous Dirichlet boundary conditions. The wavelets are orthogonal to piecewise polynomials of degree at most seven on a uniform grid. Therefore, the wavelets have eight vanishing moments, and the matrices arising from discretization of differential equations with coefficients that are piecewise polynomials of degree at most four on uniform grids are sparse. Numerical examples demonstrate the efficiency of an adaptive wavelet method with the constructed wavelet basis for solving the one-dimensional elliptic equation and the two-dimensional Black–Scholes equation with a quadratic volatility.
      Citation: Axioms
      PubDate: 2017-02-22
      DOI: 10.3390/axioms6010004
      Issue No: Vol. 6, No. 1 (2017)
       
  • Axioms, Vol. 6, Pages 5: Kullback-Leibler Divergence and Mutual
           Information of Experiments in the Fuzzy Case

    • Authors: Dagmar Markechová
      First page: 5
      Abstract: The main aim of this contribution is to define the notions of Kullback-Leibler divergence and conditional mutual information in fuzzy probability spaces and to derive the basic properties of the suggested measures. In particular, chain rules for mutual information of fuzzy partitions and for Kullback-Leibler divergence with respect to fuzzy P-measures are established. In addition, a convexity of Kullback-Leibler divergence and mutual information with respect to fuzzy P-measures is studied.
      Citation: Axioms
      PubDate: 2017-03-03
      DOI: 10.3390/axioms6010005
      Issue No: Vol. 6, No. 1 (2017)
       
  • Axioms, Vol. 6, Pages 6: Norm Retrieval and Phase Retrieval by Projections

    • Authors: Peter Casazza, Dorsa Ghoreishi, Shani Jose, Janet Tremain
      First page: 6
      Abstract: We make a detailed study of norm retrieval. We give several classification theorems for norm retrieval and give a large number of examples to go with the theory. One consequence is a new result about Parseval frames: If a Parseval frame is divided into two subsets with spans W 1 , W 2 and W 1 ∩ W 2 = { 0 } , then W 1 ⊥ W 2 .
      Citation: Axioms
      PubDate: 2017-03-04
      DOI: 10.3390/axioms6010006
      Issue No: Vol. 6, No. 1 (2017)
       
 
 
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