Izvestiya of Saratov University.
Mathematics. Mechanics. Informatics
ISSN 1816-9791 (Print)
ISSN 2541-9005 (Online)

Mathematics

On the Use of Streams in the Matrix Solution of Boundary Value Problems for the Graph
Approximation of Smooth Functions in Lp(x)2π by Vallee–Poussin Means
Integral Operators with Non-smooth Involution
Uniform Convergence of the Series with Respect to Multiplicative Systems
Affine Quantum Frames and Their Spectrum
Limit Discrete Meixner Series and Their Approximative Properties
A Countably Connected Domain is not Homeomorphic to an Uncountably Connected Domain
Expansion in Eigenfunctions of Quadratic Strongly Irregular Pencils of Differential Operators of the Second Order
On Relationship between Derivative of Multifunction and Its Support Function
Qualitative Properties of Mild Solutions of the Cauchy Problem
On the Choice of Approximation for Number of Elements in the Sequence of Values for Simple Polynomial of Argument pq with Constraints on p and q
About the Classical Solution of the Mixed Problem for the Wave Equation
The Solution of the Homogeneous Riemann Boundary Value Problem with a Countable Set of Points of Discontinuity of the First Kind its Coefficient
Almost Periodic at Infinity Solutions of Difference Equations
Generalized Characters Over Numerical Fields and a Counterpart of Chudakov Hypothesis
About Differential Operators and Matrices of the Second Order
SYSTEMS OF DIFFERENTIAL EQUATIONS ON THE LINE WITH REGULAR SINGULARITIES
Comparison Standards Method for Solving of the Multi-criterion Discrete Optimization Problems
On Variety of Semigroups of Reletions with Operation of Reflexive Double Cylindrification
Weakly Ill-posed Problems of Integral Geometry witch Perturbation on Polygonal Lines
Approximation and Reconstruction of Continuous Function with Boundary Conditions
Regularization of Abel Equation with the Use of Discontinuous Steklov Operator
Approximation of Function and Its Derivative by the Modificated Steklov Operator
About the Norms of Interpolation Processes with Fixed Nodes
On Spectrum of Schrödinger Operator on Manifold of a Special Type
On Multiple Completeness of the Root Functions of a Certain Class of Pencils of Differential Operators with Constant Coefficients
Martingales and Theorems of Cantor–Young–Bernstein and de la Vallée Poussin
Riescz Basis Property of Eigen and Associated Functions of Integral Operators with Discontinuous Kernels, Containing Involution
Green Function of the Dirichlet Boundary Value Problem for Polyharmonic Equation in a Ball Under Polynomial Data
Uniqueness of Solution of the Inverse Scattering Problem for Various Order Differential Equation on the Simplest Noncompact Graph with Cycle
On Equivalence of the Method of Steepest Descent and the Method of Hypodifferential Descent in Some Constrained Optimization Problems
About the Retrofit of the Valle’e-Poussin’s Algorithm for Approximations of Multivalued Mappings by Algebraic Polynomial with Type Constraint Equality
Embedding Theorems for P-nary Hardy and VMO Spaces
MRA on Local Fields of Positive Characteristic
Approximation of Functions of Bounded p-variation by Euler Means
Gluing Rule for Bernstein Polynomials on the Symmetric Interval
On Accuracy of Estimation of the Number of Steps for the Algorithm for Construction of Scaling Function on Local Fields
On Functional Stability of the Solution for the Problem of Convex Body Best Approximating by a Ball with Fixed Radius
Homogenization of the Acoustics Mathematical Model
Almost Contact Metric Spaces with N-connection
Several Questions of Approximation by Polynomials with Respect to Multiplicative Systems in Weighted Lp Spaces
To Chang Theorem
On a Refinement of the Asymptotic Formula for the Lebesgue Constants
An Estimate from Above of the Number of Invariant Straight Lines of n-th Degree Polynomial Vector Field
On Some Integral Properties of Modified Bessel Functions
ASYMPTOTIC RATIO OF HARMONIC MEASURES OF SLIT SIDES
Isoperimetry Coefficient for Simplex in the Problem of Approximation of Derivatives
Approximation of Control for Singularly Perturbed System with Delay with Geometric Constraints
Almost Contact Metric Structures Defined by a Symplectic Structure Over a Distribution
Some Liouville-type Theorems for the Stationary Ginsburg – Landau Equation on Quasi-model Riemannian Manifolds
Recovering Differential Operators on Star-Type Graphs with Different Orders on Different Edges
Identities of Titchmarsh Type for Generalized Hardy and Hardy–Littlewood Operators
About Solution the Generalized Boundary Value Problem of Riemann Type for Bianalytic Functions in Case of Any Simply Connected Domains
Global Improvement Method for Hamiltonian Systems with Controllable Coefficients
On Properties of the Moduli of Blocks of the Terms of the Series 1/k sin kx
Hermitian Approximation of Two Exponents
The Condition of N. P. Kuptsov s-regularity
Finite Limit Series on Chebyshev Polynomials, Orthogonal on Uniform Nets
About the Fundamental Characteristics of the Lagrange Interpolation Polynomials Family
Approximation Properties of Some Types of Linear Means in Space L p(x) 2π
On Birkhoff Interpolation of Functions of Ordered Λ-bounded Variation
Convergence of Fourier–Haar Rectangular Sums in Lebesgue Spaces with Variable Exponent L p(x,y)
The Approximation of Functions by Transformed Fourier–Vilenkin Series in the Holder Norm
Koenigs Function and Fractional Iteration of Functions Analytic in the Unit Disk with Real Coefficients and Fixed Points
Approximation of Boltsano Function by Means of Bernstein Polynomials
Boundary Control Problem for the Hyperbolic System
On Convergence of Riesz Means of the Expansions in Eigen and Associated Functions of Integral Operator with Kernel Having Jumps on Broken Lines
On Convergence of Expansions in Eigen Functions of Integral Operators with Discontinuous Kernel
Solvability of the Jump Problem on Non-smooth Arc
On Solutions of Some Boundary Value Problems for General KdV Equation
Gradient Projection Algorithm for Strongly Convex Set
Absolute Convergence of Some Series, Connected with the Fourier–Vilenkin Series
Sufficient Condition for a Change of Variable in Generalized Q-integration
On the Quasiisometric Mapping Preserving Simplex Orientation
New Estimates of the Error of Approximation of Derivatives under Interpolation of a Function on a Triangle by Polynomials of the Third Degree
The Choice of Optimal Parameters for Combined Dynamical Systems
Multivariate q-integral p-modules and Criterion of the Generalized Differentiability
Overtones of Oscillatory Boolean Matrices
Estimates for Eigenfunctions and Eigenvalues of an Integral-differential Operator
About the only Solution in the Problem of the Best Plural Reflection’s Approximation by Algebraic Polynomial
Inverse Spectral Problem of Reconstructing One-dimensional Perturbation of Integral Volterra Operator
The Solution of a Certain Inverse Problem
Investigation Riemann – Hilbert Boundary Value Problem with Infinite Index on Circle
Expansion in Root Functions of Strongly Irregular Pencil of Differential Operators of the Second Order with Multiple Characteristics
A Case of an Explicit Solutions for the Three-element Problem of Carleman Type for Analytic Functions in a Circle
Solution of Cauchy Problem for Equation First Order Via Haar Functions
A Mixed Problem for a System of First Order Differential Equations with Continuous Potential
Simulation of the Temperature and Electric Fields by High-current Pulse to the Electrode
Mazur Spaces and 4.3-intersection Property of (BM)-spaces
Well-posedness of the Dirichlet Problem for a Class of Multidimensional Elliptic-parabolic Equations
On the Existence of Continual Closed U-set
On Inverse Periodic Problem for Differential Operators for Central Symmetric Potentials
Factorization of Entire Symmetrical Functions of Exponential Type
Special Wavelets Based on Chebyshev Polynomials of the Second Kind and their Approximative Properties
About New Approach to Solution of Riemann’s Boundary Value Problem with Condition on the Half-line in Case of Infinite Index
Justification of Fourier Method in a Mixed Problem for Wave Equation with Non-zero Velocity
Stochastic Simulation of Diffusion Filtering
On the Least Type of Entire Functions of Order ½ ∈ (0, 1) with Positive Zeros
Dominant Integrands Growth Estimates and Smoothness of Variational Functionals in Sobolev Spaces
Interpolation of Continuous in Ordered H-variation Functions