1. Existence of Real Solutions of Nonlinear Equations without A Priori Normality Assumptions

   • A. V. Arutyunov

   Research Articles 06 July 2021 Pages: 3 - 14

2. A Chebyshev-Type Theorem Characterizing Best Approximation of a Continuous Function by Elements of the Sum of Two Algebras

   • A. Kh. Asgarova
   • V. É. Ismailov

   Research Articles 06 July 2021 Pages: 15 - 20

3. Criteria for a Function to Belong to the \(p\)-Variational Besov Space

   • S. S. Volosivets
   • S. A. Krayukhin

   Research Articles 06 July 2021 Pages: 21 - 28

4. First-Order Complexity of Subgraph Isomorphism via Kneser Graphs

   • V. A. Voronov
   • E. A. Dergachev
   • A. M. Neopryatnaya

   Research Articles 06 July 2021 Pages: 29 - 37

   

5. On Orbits and Bi-invariant Subsets of Binary \(G\)-Spaces

   • P. S. Gevorgyan
   • A. A. Nazaryan

   Research Articles 06 July 2021 Pages: 38 - 45

6. Density of Derivatives of Simple Partial Fractions in Hardy Spaces in the Half-Plane

   • N. A. Dyuzhina

   Research Articles 06 July 2021 Pages: 46 - 53

7. Zero Mass Case for a Nonlinear Elliptic Equation in Striplike Domains

   • A. Esfahani

   Research Articles 06 July 2021 Pages: 54 - 60

8. On Uniform Pringsheim Convergence of Double Trigonometric Series with Rarely Changing Coefficients

   • V. S. Kolesnikov

   Research Articles 06 July 2021 Pages: 61 - 73

9. On Recovering the Sturm–Liouville Differential Operators on Time Scales

   • M. A. Kuznetsova

   Research Articles 06 July 2021 Pages: 74 - 88

10. Uniqueness of the Solution of the Dirichlet Problem for a Multidimensional Differential Equation of Fractional Order

    • O. Kh. Masaeva

    Research Articles 06 July 2021 Pages: 89 - 93

11. Interpolation by Generalized Exponential Series

    • S. G. Merzlyakov

    Research Articles 06 July 2021 Pages: 94 - 101

12. Sharp Bounds for the Largest Eigenvalue

    • R. Mulas

    Research Articles 06 July 2021 Pages: 102 - 109

    

13. An Elementary Analog of the Operator Method in Additive Combinatorics

    • K. I. Ol’mezov

    Research Articles 06 July 2021 Pages: 110 - 119

    

14. On the Quasinormal Convergence of Functions

    • A. V. Osipov

    Research Articles 06 July 2021 Pages: 120 - 124

15. Optimal Dividend Policy when Cash Surplus Follows the Telegraph Process

    • I. G. Pospelov
    • S. A. Radionov

    Research Articles 06 July 2021 Pages: 125 - 135

16. Further Apéry-Like Series for Riemann Zeta Function

    • Wenchang Chu

    Research Articles 06 July 2021 Pages: 136 - 146

17. On Subsets of the Space of Bounded Sequences

    • N. N. Avdeev

    Short Communications 06 July 2021 Pages: 147 - 151

18. On the Fourier–Stieltjes Coefficients of the Function Inverse to the Minkowski Function

    • N. V. Gorbatyuk

    Short Communications 06 July 2021 Pages: 152 - 154

19. Almost Everywhere Convergence of Multiple Trigonometric Fourier Series of Functions from Sobolev Classes

    • R. R. Ashurov

    Research Articles 06 July 2021 Pages: 157 - 162

20. On Optimization of Tax Functions

    • T. V. Bogachev
    • S. N. Popova

    Research Articles 06 July 2021 Pages: 163 - 170

21. Existence of Solutions to the Second Boundary-Value Problem for the \(p\)-Laplacian on Riemannian Manifolds

    • V. V. Brovkin
    • A. A. Kon’kov

    Research Articles 06 July 2021 Pages: 171 - 183

22. An Example of a Banach Space with Non-Lipschitzian Metric Projection on Any Straight Line

    • L. Sh. Burusheva

    Research Articles 06 July 2021 Pages: 184 - 191

23. Multiplicity Results of a Nonlocal Problem Involving Concave-Convex Nonlinearities

    • A. Daoues
    • A. Hammami
    • K. Saoudi

    Research Articles 06 July 2021 Pages: 192 - 207

24. Uniqueness Theorems for Multiple Franklin Series Converging over Rectangles

    • G. G. Gevorkyan
    • L. A. Hakobyan

    Research Articles 06 July 2021 Pages: 208 - 217

25. Layer Superposition of the Root Lattice \(A_n\)

    • V. P. Grishukhin

    Research Articles 06 July 2021 Pages: 218 - 230

26. Properties of Two-Dimensional Maxima of Particle Scores in Critical Branching Processes with Immigration and Continuous Time

    • A. V. Karpenko

    Research Articles 06 July 2021 Pages: 231 - 240

    

27. Submathematics and Tropical Mathematics

    • V. P. Maslov

    Research Articles 06 July 2021 Pages: 241 - 246

28. Automorphisms of a Distance Regular Graph with Intersection Array \(\{21,18,12,4;1,1,6,21\}\)

    • A. A. Makhnev

    Research Articles 06 July 2021 Pages: 247 - 255

29. Asymptotics for the Complexity of Boolean Functions with Small Number of Ones

    • N. P. Red’kin

    Research Articles 06 July 2021 Pages: 256 - 261

30. Stability Property of Functional Equations in Modular Spaces: A Fixed-Point Approach

    • P. Saha
    • Pratap Mondal
    • B. S. Choudhury

    Research Articles 06 July 2021 Pages: 262 - 269

31. Groups Saturated with Finite Frobenius Groups

    • A. I. Sozutov

    Research Articles 06 July 2021 Pages: 270 - 279

32. Trees of Diameter 6 and 7 with Minimum Number of Independent Sets

    • D. S. Taletskii

    Research Articles 06 July 2021 Pages: 280 - 291

    

33. Third Boundary-Value Problem in the Half-Strip for the \(B\)-Parabolic Equation

    • F. G. Khushtova

    Research Articles 06 July 2021 Pages: 292 - 301

34. Differentiation of Similar Matrices

    • S. A. Vasyutkin
    • A. P. Chupakhin

    Short Communications 06 July 2021 Pages: 302 - 306

35. On Recovery of Regular Ridge Functions

    • T. I. Zaitseva
    • Yu. V. Malykhin
    • K. S. Ryutin

    Short Communications 06 July 2021 Pages: 307 - 311

36. On the Asymptotics of Solutions of the Wave Operator with Meromorphic Coefficients

    • M. V. Korovina
    • O. A. Matevosyan
    • I. N. Smirnov

    Short Communications 06 July 2021 Pages: 312 - 316

    

37. An Abnormal Set for the \((2,3,5,8)\)-Distribution

    • Yu. L. Sachkov
    • E. F. Sachkova

    Short Communications 06 July 2021 Pages: 317 - 319