Subjects -> MATHEMATICS (Total: 1118 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (819 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (819 journals)                  1 2 3 4 5 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 5)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3)
Accounting Perspectives     Full-text available via subscription   (Followers: 9)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 17)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 9)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 44)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica     Hybrid Journal   (Followers: 11)
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: 13)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 8)
Advances in Complex Systems     Hybrid Journal   (Followers: 12)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 5)
Advances in Fixed Point Theory     Open Access   (Followers: 9)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 22)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 10)
Advances in Materials Science     Open Access   (Followers: 22)
Advances in Mathematical Physics     Open Access   (Followers: 10)
Advances in Mathematics     Full-text available via subscription   (Followers: 22)
Advances in Numerical Analysis     Open Access   (Followers: 8)
Advances in Operations Research     Open Access   (Followers: 14)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Porous Media     Full-text available via subscription   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 11)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 12)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 7)
Afrika Matematika     Hybrid Journal   (Followers: 3)
Air, Soil & Water Research     Open Access   (Followers: 13)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 4)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access   (Followers: 1)
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 1)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 6)
Algebra and Logic     Hybrid Journal   (Followers: 8)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 2)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 10)
American Journal of Mathematical Analysis     Open Access   (Followers: 2)
American Journal of Mathematical and Management Sciences     Hybrid Journal   (Followers: 1)
American Journal of Mathematics     Full-text available via subscription   (Followers: 9)
American Journal of Operations Research     Open Access   (Followers: 8)
American Mathematical Monthly     Full-text available via subscription   (Followers: 7)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 13)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 10)
Analysis Mathematica     Full-text available via subscription  
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access   (Followers: 8)
Annales Mathematicae Silesianae     Open Access   (Followers: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica     Open Access   (Followers: 1)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 17)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 8)
Annals of Functional Analysis     Hybrid Journal   (Followers: 4)
Annals of Mathematics     Full-text available via subscription   (Followers: 4)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 6)
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   (Followers: 1)
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access   (Followers: 2)
Annuaire du Collège de France     Open Access   (Followers: 6)
ANZIAM Journal     Open Access   (Followers: 2)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 10)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 13)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 2)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Applied Mathematics Letters     Full-text available via subscription   (Followers: 3)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 2)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 4)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 4)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Armenian Journal of Mathematics     Open Access   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 24)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Research Journal of Mathematics     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 4)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 7)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 2)
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: 2)
Banach Journal of Mathematical Analysis     Hybrid Journal   (Followers: 1)
Basin Research     Hybrid Journal   (Followers: 6)
BIBECHANA     Open Access   (Followers: 2)
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal   (Followers: 1)
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: 3)
British Journal for the History of Mathematics     Hybrid Journal  
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: 15)
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: 3)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of Symbolic Logic     Full-text available via subscription   (Followers: 3)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 2)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the Iranian Mathematical Society     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Cadernos do IME : Série Matemática     Open Access   (Followers: 2)
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Mathematics / Journal canadien de mathématiques     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 23)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
ChemSusChem     Hybrid Journal   (Followers: 8)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 3)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access   (Followers: 1)
CODEE Journal     Open Access   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 18)
Commentarii Mathematici Helvetici     Hybrid Journal  
Communications in Advanced Mathematical Sciences     Open Access  
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 4)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 5)
Complex Analysis and its Synergies     Open Access   (Followers: 3)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Composite Materials Series     Full-text available via subscription   (Followers: 11)
Compositio Mathematica     Full-text available via subscription  
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 4)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 3)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 9)
Computational Mechanics     Hybrid Journal   (Followers: 10)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 11)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 11)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access   (Followers: 1)
Contributions to Discrete Mathematics     Open Access   (Followers: 1)
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 14)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Current Research in Biostatistics     Open Access   (Followers: 8)
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access   (Followers: 1)
Demographic Research     Open Access   (Followers: 16)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access   (Followers: 3)
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: 4)

        1 2 3 4 5 | Last

Similar Journals
Journal Cover
Boletín de la Sociedad Matemática Mexicana
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1405-213X - ISSN (Online) 2296-4495
Published by Springer-Verlag Homepage  [2658 journals]
  • Directional convexity of normalized harmonic convex mappings

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      Abstract: In this paper, we prove that convolution of two half-plane harmonic mappings with suitable dilatation is convex in some particular direction. We also prove that convolution of slanted half-plane mappings and slanted strip mapping with fixed dilatation is convex in a particular direction. We give some examples for support of our results.
      PubDate: 2021-10-07
       
  • On power integral bases of certain pure number fields defined by $$x^{42}
           - m$$ x 42 - m

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      Abstract: Let \(K = {\mathbb {Q}} (\alpha )\) be a pure number field generated by a complex root \(\alpha\) of a monic irreducible polynomial \(F(x) = x^{42} -m \in {{\mathbb {Z}}}[x]\) , where \(m \ne \pm 1\) is a square-free rational integer. In this paper, we study the monogenity of K. We prove that if \(m\not \equiv 1\ \mathrm{(mod }{4})\) , \(m\not \equiv \mp 1 \ \mathrm{(mod }{9})\) , and \(\overline{m}\not \in \{\mp 1, 18, 19, 30, 31\} \ \mathrm{(mod }{49})\) , then K is monogenic. But, if \(m \equiv 1\ \mathrm{(mod }{4})\) , or \(m \equiv 1 \ \mathrm{(mod }{9})\) , or \(m \equiv 1 \ \mathrm{(mod }{49})\) , then K is not monogenic. Our results are illustrated by some examples.
      PubDate: 2021-10-07
       
  • On $$F_3(k,n)$$ F 3 ( k , n ) -numbers of the Fibonacci type

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      Abstract: In this paper, we study a generalization of Narayana’s numbers and Padovan’s numbers. This generalization also includes a sequence whose elements are Fibonacci numbers repeated three times. We give combinatorial interpretations and a graph interpretation of these numbers. In addition, we examine matrix generators and determine connections with Pascal’s triangle.
      PubDate: 2021-10-07
       
  • Dedekind $$\eta $$ η -function identities of level 6 and an approach
           towards colored partitions

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      Abstract: Somos conjectured thousands of Dedekind \(\eta \) -function identities of various levels, around 6200 in number. He did so using computational evidence but has not sought to provide any proof for these identities. In this paper, we prove level 6 of Somos’s Dedekind \(\eta \) -function identities containing five terms in two methods. Further, as an application of these identities, we deduce colored partitions for the same.
      PubDate: 2021-10-07
       
  • The $$\phi $$ ϕ -Brunn–Minkowski inequalities for general
           convex bodies

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      Abstract: In this paper, we first give a new proof of the log-Minkowski inequality of general planar convex bodies and then extend the \(L_p\) -Brunn–Minkowski inequality and \(L_p\) -Minkowski inequality of o-symmetric planar convex bodies for \(p\in (0,1)\) to \(\phi \) -Brunn–Minkowski inequality and \(\phi \) -Minkowski inequality of general planar convex bodies. As an application, a family of \(\phi \) -measures of asymmetry for planar convex bodies is introduced.
      PubDate: 2021-10-07
       
  • Fekete–Szegö inequality for bi-univalent functions by means of
           Horadam polynomials

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      Abstract: In this paper, make use of the Horadam polynomials, we introduce a comprehensive subclass of analytic and bi-univalent functions. For functions belonging to this class we derive coefficient inequalities and the Fekete–Szegö inequalities. Also, variety observations of the results presented here are also discussed.
      PubDate: 2021-10-07
       
  • Curious properties of generalized Lucas numbers

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      Abstract: Let \(\{V_n(P,Q)\}\) be the Lucas sequence of the second kind at the nonzero relatively prime parameters P and Q. In this paper, we present techniques for studying the solutions (x, n) with \(x \ge 2, n \ge 0\) of any Diophantine equation of the form $$\begin{aligned} \frac{1}{V_n(P_2,Q_2)}=\sum _{k=1}^{\infty }\frac{V_{k-1}(P_1,Q_1)}{x^k} \end{aligned}$$ in both cases \((P_1,Q_1)=(P_2,Q_2)\) and \((P_1,Q_1)\ne (P_2,Q_2)\) , where \(Q_1, Q_2 \in \{-1,1\}\) . Furthermore, we represent the procedures of these techniques in case of \( -2 \le P_1, P_2 \le 4\) .
      PubDate: 2021-10-01
       
  • F-contraction via (CLR)-property and application to integral equations

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      Abstract: In this paper, we prove some common fixed point results of Ćirić-type \(F_M\) -contraction for weakly compatible mappings in metric space. We generalize common fixed point theorems for twelve self-mappings with (CLR)-property or common property (E.A). Also, we present examples and applications of these mappings in metric space and integral equations.
      PubDate: 2021-09-22
       
  • Correction to: Dynamical behavior of rational difference equation
           $$x_{n+1}=\frac{x_{n-17}}{\pm 1\pm
           x_{n-2}x_{n-5}x_{n-8}x_{n-11}x_{n-14}x_{n-17}}$$ x n + 1 = x n - 17 ± 1
           ± x n - 2 x n - 5 x n - 8 x n - 11 x n - 14 x n - 17

    • Free pre-print version: Loading...

      PubDate: 2021-09-22
       
  • Mathematical modelling of the dynamics of human schistosomiasis with
           time-discrete delays

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      Abstract: In this paper, we study a schistosomiasis model incorporating the miracidia and cercariae dynamics, discrete-time delays as well as control measures like water treatment. Modelling the dynamics of schistosomiasis infectious disease is quite challenging because of the different larval forms assumed by the parasite and the requirement of two hosts during the life cycle. Our model is generic in the sense that it considers both situations where particle depletion by hosts or snails could have or not a negligible impact on particle dynamics. Precisely, we introduce two parameters u and v such that when \(u=v=0\) , then particle depletion by hosts or snails is not considered; when \(u=v=1\) , then particle depletion by hosts and snails is considered. The model is analyzed to gain insights into the qualitative features of the disease-free equilibrium which allows the determination of the basic reproductive number \({\mathcal {R}}_{u,v}\) . The Center Manifold Theory is used to discuss existence and local stability of an endemic equilibrium. Global sensitivity analysis (SA) of the schistosomiasis model and the basic reproduction number are carried out. SA results of the model point out the leading role of \(\eta \) , the parameter that shapes infection-induced death rate in humans, on the dynamics of humans (susceptible and infected), miracidia, cercariae and infected snails. They also reveal the pervasive role of \(\theta \) , the water treatment-induced death rate of snails, on the dynamics of infected humans, miracidia, snails (susceptible and infected) and cercariae. SA results of the basic reproduction number highlight the role of \(\eta \) , \(\theta \) , \(\lambda \) (the contact rate of transmission of miracidia to susceptible snails), \(\varpi \) (production rate of miracidia from feces of infected humans) and \(\gamma \) (the transmission rate of cercariae to susceptible humans). Therefore, a possible way to control the disease could rely on the intensification of sanitization campaigns that will result in an increase of \(\theta \) together with sensitization about the necessity to have a treatment once you are infected to reduce \(\eta \) .
      PubDate: 2021-09-19
       
  • Some properties of starlike functions subordinate to k-Pell–Lucas
           numbers

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      Abstract: In this current work, we introduce a subfamily of analytic functions endowed with k-Pell–Lucas numbers. The radius problems, basic geometric properties and general coefficient relations are obtained for the former class.
      PubDate: 2021-09-16
       
  • The sharp bound of the third Hankel determinant for functions of bounded
           turning

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      Abstract: We find the sharp bound for the third Hankel determinant $$\begin{aligned} H_{3,1}(f):= \left {\begin{array}{*{20}c} {a_{1} } & {a_{2} } & {a_{3} } \\ {a_{2} } & {a_{3} } & {a_{4} } \\ {a_{3} } & {a_{4} } & {a_{5} } \\ \end{array} } \right \end{aligned}$$ for analytic functions f with \(a_n:=f^{(n)}(0)/n!,\ n\in \mathbb N,\ a_1:=1,\) such that $$\begin{aligned} {{\,\mathrm{Re}\,}}f'(z)>0,\quad z\in \mathbb D:=\{z \in \mathbb C: z <1\}. \end{aligned}$$
      PubDate: 2021-09-04
       
  • Repdigits base b as products of two Pell numbers or Pell–Lucas
           numbers

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      Abstract: In this paper, we determine all repdigits in base b for \(2\le b\le 10,\) which are products of two Pell numbers or Pell–Lucas numbers. It is shown that the largest Pell number which is a base b-repdigit is \(P_{6}=70=(77)_{9} =7+7\cdot 9.\) Also, we give the result that the equations \(P_{m}P_{n}+1=b^{k}\) and \(Q_{m}Q_{n}+1=b^{k}\) have no solutions for \(n\ge 5\) and \(n\ge 1,\) respectively, where \(1\le m\le n\) .
      PubDate: 2021-09-04
       
  • Approximating the Hausdorff distance by $$\alpha$$ α -dense curves

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      Abstract: We propose two algorithms to approximate the Hausdorff distance between two sets of the Euclidean space \(\mathbb {R}^{m}\) , whenever such sets can be described as the image of continuous functions defined in suitable domains. Such algorithms are derived from the main results of the paper, which are based on the so called \(\alpha\) -dense curves. These curves allow us to consider a single variable problem to obtain the desired approximations with a lower computational time than other methods. Likewise, upper bounds are provided for the approximation error of our results.
      PubDate: 2021-09-04
       
  • An irrationality result for a recursive construction

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      Abstract: By simple means we prove irrationality results for some series whose terms are recursively defined. In particular, we prove that the roots and the quotient of such series are irrational numbers.
      PubDate: 2021-09-04
       
  • Some characterizations of the circle related to circumscribed equiangular
           polygons

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      Abstract: The main purpose of this note is to prove the following: let \(n\ge 3\) be a fixed integer number and let K be a convex body such that for every equiangular circumscribed n-gon, the midpoints of its sides belong to K. Then K is a disc. We also prove that a 3-dimensional convex body K such that the centers of the faces of all its circumscribed regular tetrahedra belong to K is a ball.
      PubDate: 2021-08-25
       
  • A second-order gradient method for convex minimization

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      Abstract: This work addresses the strictly convex unconstrained minimization problem via a modified version of the gradient method. The proposal is a line search method that uses a search direction based on the gradient method. This new direction is constructed by a mixture of the negative direction of the gradient with another particular direction that uses second-order information. Unlike Newton-type methods, our algorithm does not need to compute the inverse of the Hessian of the objective function. We analyze the global convergence under an exact line search. A numerical study is carried out, to illustrate the numerical effectiveness of the method by comparing it with some conjugate gradient methods and also with the Barzilai–Borwein gradient method both in quadratic and non-linear problems.
      PubDate: 2021-08-25
       
  • A new version of the sub-super solution method for non-local problem and
           existence of positive solution for the p-Kirchhoff system

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      Abstract: In this paper, we prove a new version of the sub-super solution method for non-local problem and, as application, the existence of a positive solution for a nonlinear elliptic p- Kirchhoff system in different type of nonlinearities.
      PubDate: 2021-08-07
       
  • On transversal numbers of intersecting straight line systems and
           intersecting segment systems

    • Free pre-print version: Loading...

      Abstract: An intersecting r-uniform straight line system is an intersecting linear system whose lines consist of r points on straight line segments of \(\mathbb {R}^2\) and where any two lines share a point. Recently, the author [A. Vázquez-Ávila, On intersecting straight line systems, J. Discret. Math. Sci. Cryptogr. Accepted] proved that any intersecting r-uniform straight line system \((P,\mathcal {L})\) with \(r\ge \nu _2\) has transversal number at most \(\nu _2-1\) , where \(\nu _2\) is the maximum cardinality of a subset of lines \(R\subseteq \mathcal {L}\) such that every triplet of different elements of R does not have a common point. This paper improves such upper bound if the intersecting r-uniform straight line system satisfies \(r=\nu _2\) . Also, those results have immediate consequences for some questions given by Oliveros et al. in [D. Oliveros, C. O’Neill and S. Zerbib, The geometry and combinatorics of discrete line segment hypergraphs, Discrete Math. 343 (2020), no. 6, 111825].
      PubDate: 2021-08-07
       
  • New oscillation results for non-canonical higher order nonlinear neutral
           dynamic equations

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      Abstract: We shall present new oscillation criteria for non-canonical higher order nonlinear neutral dynamic equations of the form $$\begin{aligned} \left( (a(t)\left( y^{\varDelta ^{n-1}}(t)\right) ^{\alpha }\right) ^{\varDelta }+q(t)x^{\beta }(\tau (t))=0, \end{aligned}$$ where \(y(t)=x(t)+p(t)x^{\gamma }(\delta (t)).\) We also present some oscillation results for certain second order dynamic equations with sublinear as well as super linear neutral terms.
      PubDate: 2021-08-07
       
 
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