Subjects -> MATHEMATICS (Total: 1013 journals)     - APPLIED MATHEMATICS (92 journals)    - GEOMETRY AND TOPOLOGY (23 journals)    - MATHEMATICS (714 journals)    - MATHEMATICS (GENERAL) (45 journals)    - NUMERICAL ANALYSIS (26 journals)    - PROBABILITIES AND MATH STATISTICS (113 journals) MATHEMATICS (714 journals)            First | 1 2 3 4
 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

First | 1 2 3 4

Similar Journals
 Russian MathematicsJournal Prestige (SJR): 0.377 Number of Followers: 0      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1066-369X - ISSN (Online) 1934-810X Published by Springer-Verlag  [2469 journals]
• Kaczmarz Method for Fuzzy Linear Systems

Abstract: Abstract A Kaczmarz method is presented for solving a class of fuzzy linear systems of equations with crisp coefficient matrix and fuzzy right-hand side. The iterative scheme is established and the convergence theorem is provided. Numerical examples show that the method is effective.
PubDate: 2021-12-01
DOI: 10.3103/S1066369X21120033

• Existence and Uniqueness of a Positive Solution to a Boundary Value
Problem for a Second Order Functional-Differential Equation

Abstract: Abstract In the paper, we consider a boundary value problem for a second order functional-differential equation with sufficiently general linear homogeneous boundary conditions. On the basis of the theory of semi-ordered spaces and with the help of special topological methods, we prove the existence of a unique positive solution to the problem.
PubDate: 2021-12-01
DOI: 10.3103/S1066369X2112001X

• Sobolev Orthogonal Systems with Two Discrete Points and Fourier Series

Abstract: Abstract We consider the properties of systems of functions $$\Phi_1$$ orthogonal with respect to a discrete-continuous Sobolev inner product of the form $$\langle f,g \rangle_S = f(a)g(a)+f(b)g(b)+\int_a^b f'(t)g'(t)dt$$ . In particular, we study the completeness of systems $$\Phi_1$$ in the Sobolev space $$W^1_{L^2}$$ . Additionally, we analyze the properties of Fourier series with respect to systems $$\Phi_1$$ , and prove that these series converge uniformly to functions from $$W^1_{L^2}$$ .
PubDate: 2021-12-01
DOI: 10.3103/S1066369X21120057

• Exponent Estimation for Stable Solutions of a Certain Class of
Differential-Difference Equations

Abstract: Abstract For a differential-difference equation with a positive fundamental solution we obtain exponential stability conditions with exact estimates of the exponent and the coefficient of the exponential decay. These estimates are expressed in terms of the largest of two possible real roots of the characteristic function. We prove that one can obtain exact estimates for any solution by estimating the fundamental solution, taking into account the norm of the initial function. We establish two-sided estimates for the fundamental solution in the case, when equation parameters are given as intervals.
PubDate: 2021-12-01
DOI: 10.3103/S1066369X21120069

• Lie Algebras of Projective Motions of Five-Dimensional H-Spaces $H_{221}$
of Type {221}

Abstract: Abstract We study five-dimensional pseudo-Riemannian h-spaces $$H_{221}$$ of type $$\{221\}$$ . Necessary and sufficient conditions are determined under which $$H_{221}$$ is a space of constant (zero) curvature. Nonhomothetical projective motions in $$H_{221}$$ of nonconstant curvature are found, homotheties and isometries of the indicated spaces are investigated. Dimensions, basis elements, and structure equations of maximal projective Lie algebras acting in $$H_{221}$$ of nonconstant curvature are determined. As a result, the classification of h-spaces $$H_{221}$$ of type $$\{221\}$$ by (non-homothetical) Lie algebras of infinitesimal projective and affine transformations is obtained.
PubDate: 2021-12-01
DOI: 10.3103/S1066369X21120021

• A Problem with Local and Nonlocal Conditions on the Boundary of the
Ellipticity Domain for a Mixed Type Equation

Abstract: Abstract For the Gellerstedt equation with a singular coefficient in some mixed domain, when the ellipticity boundary coincides with the segment of the Oy axis and the normal curve of the equation, a problem with the Bitsadze–Samarskii conditions on the elliptic boundary and on the degeneration line is studied. The well-posedness of the formulated problem is proved.
PubDate: 2021-12-01
DOI: 10.3103/S1066369X21120070

• Structures of Degrees of Negative Representations of Linear Orders

Abstract: Abstract The structures of partially ordered sets of degrees of negative and positive representability of linear orders are studied. The focus is on the negative representability of linear orders and orders with endomorphisms. In particular, for these structures, we established the existence of incomparable, maximal, and minimal degrees, infinite chains and anti-chains, and also considered the connection with the concepts of the reducibility of enumerartions, splittable degrees and positive representations.
PubDate: 2021-12-01
DOI: 10.3103/S1066369X21120045

• On the Generalized Absolute Cesàro Summability Methods

Abstract: Abstract In this paper, a theorem on $${\mid{C},\alpha\mid}_k$$ summability of an infinite series is generalized for the $$\varphi-{\mid{C},\alpha; \delta\mid}_k$$ summability method. Also, a known result dealing with $${\mid{C},1\mid}_k$$ summability is given.
PubDate: 2021-11-01
DOI: 10.3103/S1066369X21110049

• An Application of Almost Increasing Sequences

Abstract: Abstract In this paper, a general theorem on absolute Cesàro summability of an infinite series is proved by using an almost increasing sequence instead of a positive non-decreasing sequence
PubDate: 2021-11-01
DOI: 10.3103/S1066369X21110025

• A Generalization of the Polia–Szego and Makai Inequalities for
Torsional Rigidity

Abstract: Abstract We establish some generalizations of the classical inequalities by Polya–Szego and Makai about torsional rigidity of convex domains. The main idea of the proof is in using an exact isoperimetric inequality for Euclidean moments of domains. This inequality has a wide class of extremal regions and is of independent interest.
PubDate: 2021-11-01
DOI: 10.3103/S1066369X21110086

• On Delta-Extension for a Noether Operator

Abstract: Abstract We examine a third kind integral equation in the class of generalized functions. We show that the considered equation has similar solvability properties as the Fredholm equation of the second kind.
PubDate: 2021-11-01
DOI: 10.3103/S1066369X21110050

• A Solution to a Boundary-Value Problem for Integro-Differential Equations
with Weakly Singular Kernels

Abstract: Abstract A linear boundary-value problem for a system of integro-differential equations with weakly singular kernels is considered. Questions of the unique solvability and the construction of algorithms for finding solution to the considered problem are studied. Conditions for the solvability of the boundary-value problem for a system of integro-differential equations with weakly singular kernels are established using the Dzhumabaev parametrization method based on splitting the interval and introducing additional parameters. Necessary and sufficient conditions for the solvability of the two-point problem for integro-differential equations with weakly singular kernels are obtained.
PubDate: 2021-11-01
DOI: 10.3103/S1066369X21110013

• On the Curvatures of a Curve in n-Dimensional Euclidean Space

Abstract: Abstract Formulas are obtained for calculating the curvatures of an implicitly defined curve in n-dimensional Euclidean space. For these curves, Beltrami's theorem is generalized, which was proved by Beltrami in the case of three-dimensional space.
PubDate: 2021-11-01
DOI: 10.3103/S1066369X21110062

• Dynamic Behavior of a Class of Delayed Lotka–Volterra Recurrent
Neural Networks on Time Scales

Abstract: Abstract In this paper, Lotka–Volterra recurrent neural networks with time-varying delays on time scales are considered. Using Banach's fixed-point principle, the theory of calculus on time scales and suitable Lyapunov functional, some sufficient conditions for the existence, uniqueness and Stepanov-exponential stability of positive weighted Stepanov-like pseudo almost periodic solution on time scales to the recurrent neural networks are established. Finally, an illustrative example and simulations are presented to demonstrate the effectiveness of the theoretical findings of the paper. The results of this paper are new and generalize some previously-reported results in the literature.
PubDate: 2021-11-01
DOI: 10.3103/S1066369X21110074

• On the Modified Third Method in the Pursuit Problem for
Differential-Difference Equations of Neutral Type

Abstract: Abstract In this paper, we study linear differential games described by a system of linear differential-difference equations of neutral type under geometric constraints on the controls of the players. Modified third method in the pursuit problem and modified method of directional pursuit are established for differential-difference equations of neutral type. We obtain new sufficient conditions on parameters of the process guaranteeing finishing the game in a definite finite time.
PubDate: 2021-11-01
DOI: 10.3103/S1066369X21110037

• Approximate Calculation of the Coefficients of the Dulac Series

Abstract: Abstract An algorithm for the approximate calculation of the coefficients of the Dulac series (an asymptotic series of the monodromy transformation) in the space of vector fields with a Newton diagram containing more than one edge and a monodromic singular point is proposed. The conditions for the applicability of this algorithm are obtained. The algorithm is implemented in the MAPLE package. Examples are given for the case of a Newton diagram consisting of two edges.
PubDate: 2021-10-01
DOI: 10.3103/S1066369X21100030

• Modified Bianchi Equation with Nonlinear Right-Hand Side

Abstract: Abstract We study a nonlinear Bianchi equation which contains power nonlinearities in unknown function and its first derivatives. The method of separation of variables is used for investigation. An exponential solution is found in the case of an autonomous equation with linearly homogeneous right-hand side. It is shown that the equation has a solution in the form of a polylinear function in the case when the right-hand side of the equation contains the product of power functions of independent variables. Also, we have found solutions in the form of linear combination of exponents and in the form of generalized polynomials. The conditions on the parameters of the equation are given under which the above-mentioned solutions exist. Theorems determining the possibility of decreasing the dimension of the equation are proved. In particular, the initial equation is reduced to an ordinary differential equation for the solutions in the form of one- dimensional traveling waves, and it is reduced to a partial differential equation of lesser dimension for the solutions in the form of multi-dimensional traveling waves. In the latter case, a solution is found in the form of a generalized polynomial in linear combinations of independent variables.
PubDate: 2021-10-01
DOI: 10.3103/S1066369X21100042

• Initial–Boundary Value Problems for Equation of Oscillations of a
Rectangular Plate

Abstract: Abstract In this paper, we study problems with initial conditions for equation of oscillations of a rectangular plate subject to various boundary conditions. We establish an energy inequality, which implies the uniqueness of solution to three initial-boundary value problems. In the case, when the plate is hinged at its edges, we prove existence and stability theorems for the problem solution in classes of regular and generalized solutions.
PubDate: 2021-10-01
DOI: 10.3103/S1066369X21100054

• Asymptotic Density and Computability

Abstract: Abstract We prove that a set is bi-immune if and only if its images under computable permutations are not generically computable or effectively densely computable sets. An example of a coarsely computable bi-immune set is constructed. It is also proved that for any set there is a permutation from the same Turing degree such that its image under this permutation is an effectively densely computable set. Upper densities of weakly 1-generic sets are studied.
PubDate: 2021-10-01
DOI: 10.3103/S1066369X21100017

• Exact Estimates of the Best Rational Approximations of Functions with
Derivative of Generalized Finite Variation

Abstract: Abstract This paper is devoted to exact (in the sense of the order of smallness) estimates of the best rational approximations of functions with derivative of generalized finite variation on a finite segment of a straight line in uniform and integral metrics. The obtained results were announced in the authors' paper in 2014. They are analogous to the results of the first author, where A. Khatamov establishes exact (in the sense of the order of smallness) estimates of the best spline approximations of functions with derivative of generalized finite variation on a finite segment of a straight line in uniform and integral metrics. Results announced by the authors in 2014 generalize those obtained by N.Sh. Zagirov in 1982, namely, exact (in the sense of the order of smallness) estimates of rational approximations of functions with generalized finite variation in the integral metric, to the best rational approximations of functions with derivative of generalized finite variation on a finite segment in uniform and integral metrics. Generally speaking, the calculation of exact (in the sense of the order of smallness) estimates for the best approximations for any class of functions in any metric is a difficult problem.
PubDate: 2021-10-01
DOI: 10.3103/S1066369X21100066

JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762