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 Showing 601 - 538 of 538 Journals sorted alphabetically Research in the Mathematical Sciences Research Journal of Pure Algebra       (Followers: 1) Researches in Mathematics Results in Control and Optimization Results in Mathematics Results in Nonlinear Analysis Review of Symbolic Logic       (Followers: 2) Reviews in Mathematical Physics       (Followers: 1) Revista Baiana de Educação Matemática Revista Bases de la Ciencia Revista BoEM - Boletim online de Educação Matemática Revista Colombiana de Matemáticas       (Followers: 1) Revista de Ciencias Revista de Educación Matemática Revista de la Escuela de Perfeccionamiento en Investigación Operativa Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales. Serie A. Matematicas Revista de Matemática : Teoría y Aplicaciones       (Followers: 1) Revista Digital: Matemática, Educación e Internet Revista Electrónica de Conocimientos, Saberes y Prácticas Revista Integración : Temas de Matemáticas Revista Internacional de Sistemas Revista Latinoamericana de Etnomatemática Revista Latinoamericana de Investigación en Matemática Educativa Revista Matemática Complutense Revista REAMEC : Rede Amazônica de Educação em Ciências e Matemática Revista SIGMA Ricerche di Matematica RMS : Research in Mathematics & Statistics Royal Society Open Science       (Followers: 7) Russian Journal of Mathematical Physics Russian Mathematics Sahand Communications in Mathematical Analysis Sampling Theory, Signal Processing, and Data Analysis São Paulo Journal of Mathematical Sciences Science China Mathematics       (Followers: 1) Science Progress       (Followers: 1) Sciences & Technologie A : sciences exactes Selecta Mathematica       (Followers: 1) SeMA Journal Semigroup Forum       (Followers: 1) Set-Valued and Variational Analysis SIAM Journal on Applied Mathematics       (Followers: 11) SIAM Journal on Computing       (Followers: 11) SIAM Journal on Control and Optimization       (Followers: 18) SIAM Journal on Discrete Mathematics       (Followers: 8) SIAM Journal on Financial Mathematics       (Followers: 3) SIAM Journal on Mathematics of Data Science       (Followers: 1) SIAM Journal on Matrix Analysis and Applications       (Followers: 3) SIAM Journal on Optimization       (Followers: 12) Siberian Advances in Mathematics Siberian Mathematical Journal Sigmae SILICON SN Partial Differential Equations and Applications Soft Computing       (Followers: 7) Statistics and Computing       (Followers: 14) Stochastic Analysis and Applications       (Followers: 3) Stochastic Partial Differential Equations : Analysis and Computations       (Followers: 2) Stochastic Processes and their Applications       (Followers: 6) Stochastics and Dynamics       (Followers: 2) Studia Scientiarum Mathematicarum Hungarica       (Followers: 1) Studia Universitatis Babeș-Bolyai Informatica Studies In Applied Mathematics       (Followers: 1) Studies in Mathematical Sciences       (Followers: 1) Superficies y vacio Suska Journal of Mathematics Education       (Followers: 1) Swiss Journal of Geosciences       (Followers: 1) Synthesis Lectures on Algorithms and Software in Engineering       (Followers: 2) Synthesis Lectures on Mathematics and Statistics       (Followers: 1) Tamkang Journal of Mathematics Tatra Mountains Mathematical Publications Teaching Mathematics       (Followers: 10) Teaching Mathematics and its Applications: An International Journal of the IMA       (Followers: 4) Teaching Statistics       (Followers: 8) Technometrics       (Followers: 8) The Journal of Supercomputing       (Followers: 1) The Mathematica journal The Mathematical Gazette       (Followers: 1) The Mathematical Intelligencer The Ramanujan Journal The VLDB Journal       (Followers: 2) Theoretical and Mathematical Physics       (Followers: 7) Theory and Applications of Graphs Topological Methods in Nonlinear Analysis Transactions of the London Mathematical Society       (Followers: 1) Transformation Groups Turkish Journal of Mathematics Ukrainian Mathematical Journal Uniciencia Uniform Distribution Theory Unisda Journal of Mathematics and Computer Science Unnes Journal of Mathematics       (Followers: 1) Unnes Journal of Mathematics Education       (Followers: 2) Unnes Journal of Mathematics Education Research       (Followers: 1) Ural Mathematical Journal Vestnik Samarskogo Gosudarstvennogo Tekhnicheskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki Vestnik St. Petersburg University: Mathematics VFAST Transactions on Mathematics       (Followers: 1) Vietnam Journal of Mathematics Vinculum Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics       (Followers: 2) Water SA       (Followers: 1) Water Waves Zamm-Zeitschrift Fuer Angewandte Mathematik Und Mechanik       (Followers: 1) ZDM       (Followers: 2) Zeitschrift für angewandte Mathematik und Physik       (Followers: 2) Zeitschrift fur Energiewirtschaft Zetetike

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Similar Journals
 Ural Mathematical JournalNumber of Followers: 0     Open Access journal ISSN (Online) 2414-3952 Published by Russian Academy of Sciences  [15 journals]
• FIXED POINT THEOREM FOR MULTIVALUED NON-SELF MAPPINGS SATISFYING
JS-CONTRACTION WITH AN APPLICATION

• Authors: David Aron, Santosh Kumar
Pages: 3 - 12
Abstract: In this paper, we present some fixed point results for multivalued non-self mappings. We generalize the fixed point theorem due to Altun and Minak [2] by using Jleli and Sameti [9] $$\vartheta$$-contraction. To validate the results proved here, we provide an appropriate application of our main result.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.001
Issue No: Vol. 8, No. 1 (2022)

• ON $$A^{\mathcal{I^{K}}}$$–SUMMABILITY

• Authors: Chiranjib Choudhury, Shyamal Debnath
Pages: 13 - 22
Abstract: In this paper, we introduce and investigate the concept of $$A^{\mathcal{I^{K}}}$$-summability as an extension of $$A^{\mathcal{I^{*}}}$$-summability which was recently (2021) introduced by O.H.H.~Edely, where $$A=(a_{nk})_{n,k=1}^{\infty}$$ is a non-negative regular matrix and $$\mathcal{I}$$ and $$\mathcal{K}$$ represent two non-trivial admissible ideals in $$\mathbb{N}$$. We study some of its fundamental properties as well as a few inclusion relationships with some other known summability methods. We prove that $$A^{\mathcal{K}}$$-summability always implies $$A^{\mathcal{I^{K}}}$$-summability whereas $$A^{\mathcal{I}}$$-summability not necessarily implies $$A^{\mathcal{I^{K}}}$$-summability. Finally, we give a condition namely $$AP(\mathcal{I},\mathcal{K})$$ (which is a natural generalization of the condition $$AP$$) under which $$A^{\mathcal{I}}$$-summability implies $$A^{\mathcal{I^{K}}}$$-summability.

PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.002
Issue No: Vol. 8, No. 1 (2022)

• INDUCED $$nK_{2}$$ DECOMPOSITION OF INFINITE SQUARE GRIDS AND INFINITE
HEXAGONAL GRIDS

• Authors: Dinesan Deepthy, Joseph Varghese Kureethara
Pages: 23 - 33
Abstract: The induced $$nK_2$$ decomposition of infinite square grids and hexagonal grids are described here. We use the multi-level distance edge labeling as an effective technique in the decomposition of square grids. If the edges are adjacent, then their color difference is at least 2 and if they are separated by exactly a single edge, then their colors must be distinct. Only non-negative integers are used for labeling. The proposed partitioning technique per the edge labels to get the induced $$nK_2$$ decomposition of the ladder graph is the square grid and the hexagonal grid.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.003
Issue No: Vol. 8, No. 1 (2022)

• HJB-INEQUALITIES IN ESTIMATING REACHABLE SETS OF A CONTROL SYSTEM UNDER
UNCERTAINTY

• Authors: Tatiana F. Filippova
Pages: 34 - 42
Abstract: Using the technique of generalized inequalities of the Hamilton--Jacobi--Bellman type, we study here the state estimation problem for a control system which operates under conditions of uncertainty and nonlinearity of a special kind, when the dynamic equations describing the studied system  simultaneously contain the different forms of nonlinearity in state velocities. Namely, quadratic functions and uncertain matrices of state  elocity coefficients are presented therein. The external ellipsoidal bounds for reachable sets are found, some approaches which may produce internal estimates for such sets are also mentioned. The example is included to illustrate the result.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.004
Issue No: Vol. 8, No. 1 (2022)

• APPROXIMATION OF POSITIONAL IMPULSE CONTROLS FOR DIFFERENTIAL INCLUSIONS

• Authors: Ivan A. Finogenko, Alexander N. Sesekin
Pages: 43 - 54
Abstract: Nonlinear control systems presented as differential inclusions with positional impulse controls are investigated. By such a control we mean some abstract operator with the Dirac function concentrated at each time. Such a control ("running impulse"), as a generalized function, has no meaning and is formalized as a sequence of correcting impulse actions on the system corresponding to a directed set of partitions of the control interval. The system responds to such control by discontinuous trajectories, which form a network of so-called "Euler's broken lines." If, as a result of each such correction, the phase point of the object under study is on some given manifold (hypersurface), then a slip-type effect is introduced into the motion of the system, and then the network of "Euler's broken lines" is called an impulse-sliding mode. The paper deals with the problem of approximating impulse-sliding modes using sequences of continuous delta-like functions. The research is based on Yosida's approximation of set-valued mappings and some well-known facts for ordinary differential equations with impulses.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.005
Issue No: Vol. 8, No. 1 (2022)

• ON SOLVING AN ENHANCED EVASION PROBLEM FOR LINEAR DISCRETE–TIME
SYSTEMS

• Authors: Elena K. Kostousova
Pages: 55 - 63
Abstract: We consider the problem of an enhanced evasion for linear discrete-time systems, where there are two conflicting bounded controls and the aim of one of them is to be guaranteed to avoid the trajectory hitting a given target set at a given final time and also at intermediate instants. First we outline a common solution scheme based on the construction of so called solvability tubes or repulsive tubes. Then a much more quick and simple for realization method based on the construction of the tubes with parallelepiped-valued cross-sections is presented under assumptions that the target set is a parallelepiped and parallelotope-valued constraints on controls are imposed. An example illustrating this method is considered.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.006
Issue No: Vol. 8, No. 1 (2022)

• ON DOUBLE SIGNAL NUMBER OF A GRAPH

• Authors: X. Lenin Xaviour, S. Ancy Mary
Pages: 64 - 75
Abstract: A set $$S$$ of vertices in a connected graph $$G=(V,E)$$ is called a signal set if every vertex not in $$S$$ lies on a signal path between two vertices from $$S$$. A set $$S$$ is called a double signal set of $$G$$ if $$S$$ if for each pair of vertices $$x,y \in G$$ there exist $$u,v \in S$$ such that $$x,y \in L[u,v]$$. The double signal number $$\mathrm{dsn}\,(G)$$ of $$G$$ is the minimum cardinality of a double signal set. Any double signal set of cardinality $$\mathrm{dsn}\,(G)$$ is called $$\mathrm{dsn}$$-set of $$G$$. In this paper we introduce and initiate some properties on double signal number of a graph. We have also given relation between geodetic number, signal number and double signal number for some classes of graphs.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.007
Issue No: Vol. 8, No. 1 (2022)

• MATRIX RESOLVING FUNCTIONS IN THE LINEAR GROUP PURSUIT PROBLEM WITH
FRACTIONAL DERIVATIVES

• Authors: Alena I. Machtakova, Nikolai N. Petrov
Pages: 76 - 89
Abstract: In finite-dimensional Euclidean space, we analyze the problem of pursuit of a single evader by a group of pursuers, which is described by a system of differential equations with Caputo fractional derivatives of order $$alpha.$$ The goal of the group of pursuers is the capture of the evader by at least $$m$$ different pursuers (the instants of capture may or may not coincide). As a mathematical basis, we use matrix resolving functions that are generalizations of scalar resolving functions. We obtain sufficient conditions for multiple capture of a single evader in the class of quasi-strategies. We give examples illustrating the results obtained.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.008
Issue No: Vol. 8, No. 1 (2022)

• A MARKOVIAN TWO COMMODITY QUEUEING–INVENTORY SYSTEM WITH COMPLIMENT ITEM
AND CLASSICAL RETRIAL FACILITY

• Authors: M. Nithya, C. Sugapriya, S. Selvakumar, K. Jeganathan, T. Harikrishnan
Pages: 90 - 116
Abstract: This paper explores the two-commodity (TC) inventory system in which commodities are classified as major and complementary items. The system allows a customer who has purchased a free product to conduct Bernoulli trials at will. Under the Bernoulli schedule, any entering customer will quickly enter an orbit of infinite capability during the stock-out time of the major item. The arrival of a retrial customer in the system follows a classical retrial policy. These two products' re-ordering process occurs under the $$(s, Q)$$ and instantaneous ordering policies for the major and complimentary items, respectively. A comprehensive analysis of the retrial queue, including the system's stability and the steady-state distribution of the retrial queue with the stock levels of two commodities, is carried out. The various system operations are measured under the stability condition. Finally, numerical evidence has shown the benefits of the proposed model under different random situations.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.009
Issue No: Vol. 8, No. 1 (2022)

• MONOPOLISTIC COMPETITION MODEL WITH ENTRANCE FEE

• Authors: Olga A. Tilzo
Pages: 117 - 127
Abstract: We study the monopolistic competition model with producer-retailer-consumers two-level interaction. The industry is organized according to the Dixit–Stiglitz model. The retailer is the only monopolist. A quadratic utility function represents consumer preferences. We consider the case of the retailer's leadership; namely, we study two types of behavior: with and without the free entry condition. Earlier, we obtained the result: to increase social welfare and/or consumer surplus, the government needs to subsidize (not tax!) retailers. In the presented paper, we develop these results for the situation when the producer imposes an entrance fee for retailers.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.010
Issue No: Vol. 8, No. 1 (2022)

• HANKEL DETERMINANT OF CERTAIN ORDERS FOR SOME SUBCLASSES OF HOLOMORPHIC
FUNCTIONS

• Authors: D. Vamshee Krishna, D. Shalini
Pages: 128 - 135
Abstract: In this paper, we are introducing certain subfamilies of holomorphic functions and making an attempt to obtain an upper bound (UB) to the second and third order Hankel determinants by applying certain lemmas, Toeplitz determinants, for the normalized analytic functions belong to these classes, defined on the open unit disc in the complex plane. For one of the inequality, we have obtained sharp bound.
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.011
Issue No: Vol. 8, No. 1 (2022)

• EVOLUTION OF A MULTISCALE SINGULARITY OF THE SOLUTION OF THE BURGERS
EQUATION IN THE 4-DIMENSIONAL SPACE–TIME

• Authors: Sergey V. Zakharov
Pages: 136 - 144
Abstract: The solution of the Cauchy problem for the vector Burgers equation with a small parameter of dissipation $$\varepsilon$$ in the $$4$$-dimensional space-time is studied:
$$\mathbf{u}_t + (\mathbf{u}\nabla) \mathbf{u} = \varepsilon \triangle \mathbf{u}, \quad u_{\nu} (\mathbf{x}, -1, \varepsilon) = - x_{\nu} + 4^{-\nu}(\nu + 1) x_{\nu}^{2\nu + 1},$$
With the help of the Cole–Hopf transform $$\mathbf{u} = - 2 \varepsilon \nabla \ln H,$$ the exact solution and its leading asymptotic approximation, depending on six space-time scales, near a singular point are found. A formula for the growth of partial derivatives of the components of the vector field $$\mathbf{u}$$ on the time interval from the initial moment to the singular point, called the formula of the gradient catastrophe, is established:
$$\frac{\partial u_{\nu} (0, t, \varepsilon)}{\partial x_{\nu}} = \frac{1}{t} \left[ 1 + O \left( \varepsilon t ^{- 1 - 1/\nu} \right) \right]\!, \quad \frac{t}{\varepsilon^{\nu /(\nu + 1)} } \to -\infty, \quad t \to -0.$$
The asymptotics of the solution far from the singular point, involving a multistep reconstruction of the space-time scales, is also obtained:
$$u_{\nu} (\mathbf{x}, t, \varepsilon) \approx - 2 \left( \frac{t}{\nu + 1} \right)^{1/2\nu} \tanh \left[ \frac{x_{\nu}}{\varepsilon} \left( \frac{t}{\nu + 1} \right)^{1/2\nu} \right]\!, \quad \frac{t}{\varepsilon^{\nu /(\nu + 1)} } \to +\infty.$$
PubDate: 2022-07-29
DOI: 10.15826/umj.2022.1.012
Issue No: Vol. 8, No. 1 (2022)

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