1. The Relation “Commutator Equals Function” in Banach Algebras

   • O. Yu. Aristov

   Research Articles 06 July 2021 Pages: 323 - 334

2. Some Finiteness Results for Local Cohomology Modules with Respect to a Pair of Ideals

   • Batoul Naal
   • Kazem Khashyarmanesh

   Research Articles 06 July 2021 Pages: 335 - 346

3. Probabilistic Interpretation of the Vanishing Viscosity Method for Systems of Conservation and Balance Laws

   • Ya. I. Belopol’skaya

   Research Articles 06 July 2021 Pages: 347 - 357

4. Direct and Inverse Problems for the Matrix Sturm–Liouville Operator with General Self-Adjoint Boundary Conditions

   • N. P. Bondarenko

   Research Articles 06 July 2021 Pages: 358 - 378

5. Example of Divergence of a Greedy Algorithm with Respect to an Asymmetric Dictionary

   • P. A. Borodin

   Research Articles 06 July 2021 Pages: 379 - 385

6. An Invariant Subbundle of the KZ Connection mod \(p\) and Reducibility of \(\widehat{{\mathfrak{sl}_2}}\) Verma Modules mod \(p\)

   • A. Varchenko

   Research Articles 06 July 2021 Pages: 386 - 397

7. Underlying Manifolds of High-Dimensional Morse–Smale Diffeomorphisms with Two Saddle Periodic Points

   • E. V. Zhuzhoma
   • V. S. Medvedev

   Research Articles 06 July 2021 Pages: 398 - 404

8. Colength Growth Functions of Nonassociative Algebras

   • M. V. Zaicev
   • D. D. Repovš

   Research Articles 06 July 2021 Pages: 405 - 412

9. Invariant Spaces of Entire Functions

   • A. S. Krivosheev
   • O. A. Krivosheeva

   Research Articles 06 July 2021 Pages: 413 - 426

10. On the Uniqueness Sets of Multiple Walsh Series for Convergence in Cubes

    • S. F. Lukomskii

    Research Articles 06 July 2021 Pages: 427 - 434

11. On the Construction of Stability Indicators for Nonnegative Matrices

    • V. N. Razzhevaikin
    • E. E. Tyrtyshnikov

    Research Articles 06 July 2021 Pages: 435 - 444

12. Formula Complexity of a Linear Function in a \(k\)-ary Basis

    • I. S. Sergeev

    Research Articles 06 July 2021 Pages: 445 - 458

    

13. On Orthogonal Systems with Extremely Large \(L_2\)-Norm of the Maximal Operator

    • A. P. Solodov

    Research Articles 06 July 2021 Pages: 459 - 472

14. Local Discrepancies in the Problem of the Distribution of the Sequence \(\{k\alpha\}\)

    • A. V. Shutov

    Research Articles 06 July 2021 Pages: 473 - 482

15. Abscissa of Absolute Convergence of a Class of Generalized Euler Products

    • N. N. Dobrovol’skii

    Short Communications 06 July 2021 Pages: 483 - 488

16. Existence Conditions for Extremal Probability Measures on Polish Spaces and Some of Their Properties

    • A. A. Nesterenko
    • V. M. Khametov
    • E. A. Shelemekh

    Short Communications 06 July 2021 Pages: 489 - 493

17. A Criterion for a Normed Algebra in the Scale of Sobolev Spaces

    • M. D. Ramazanov

    Short Communications 06 July 2021 Pages: 494 - 497

18. On the Standard Conjecture for Compactifications of Néron Models of Three-Dimensional Abelian Varieties with Multiplications in an Imaginary Quadratic Field

    • S. G. Tankeev

    Short Communications 06 July 2021 Pages: 498 - 499

19. Implicit Function. Controllability and Perturbation of Optimal Control Problems

    • E. R. Avakov
    • G. G. Magaril-Il’yaev

    Research Articles 06 July 2021 Pages: 503 - 516

20. A Vulnerability Parameter of Networks

    • C. Çiftçi
    • A. Aytaç

    Research Articles 06 July 2021 Pages: 517 - 526

21. Estimates of Derivatives in Sobolev Spaces in Terms of Hypergeometric Functions

    • T. A. Garmanova

    Research Articles 06 July 2021 Pages: 527 - 533

22. On the Existence and Stability of an Infinite-Dimensional Invariant Torus

    • S. D. Glyzin
    • A. Yu. Kolesov
    • N. Kh. Rozov

    Research Articles 06 July 2021 Pages: 534 - 550

23. Existence of \(T/k\)-Periodic Solutions of a Nonlinear Nonautonomous System Whose Matrix Has a Multiple Eigenvalue

    • V. V. Yevstafyeva

    Research Articles 06 July 2021 Pages: 551 - 562

    

24. Uniqueness of the Solution of a Nonlocal Problem for an Elliptic-Hyperbolic Equation with Singular Coefficients

    • N. V. Zaitseva

    Research Articles 06 July 2021 Pages: 563 - 569

25. Integral Inequalities in the Theory of Hessian Operators

    • N. M. Ivochkina
    • S. I. Prokof’eva
    • G. V. Yakunina

    Research Articles 06 July 2021 Pages: 570 - 579

26. On the Kegel–Wielandt \(\sigma\)-Problem

    • S. F. Kamornikov
    • V. N. Tyutyanov

    Research Articles 06 July 2021 Pages: 580 - 584

27. Controlled Semi-Markov Processes with Constraints on Control Strategies and Construction of Optimal Strategies in Reliability and Safety Models

    • V. A. Kashtanov
    • O. B. Zaitseva
    • A. A. Efremov

    Research Articles 06 July 2021 Pages: 585 - 592

28. Conditions for Acts over Semilattices to be Cantor

    • I. B. Kozhukhov
    • A. S. Sotov

    Research Articles 06 July 2021 Pages: 593 - 599

29. Absence of Solutions for a System of Ordinary Differential Inequalities

    • Xiaohong Li
    • Haitao Wan
    • Xiliang Li

    Research Articles 06 July 2021 Pages: 600 - 608

30. Smooth Prime Fano Complete Intersections in Toric Varieties

    • V. V. Przyjalkowski
    • C. A. Shramov

    Research Articles 06 July 2021 Pages: 609 - 613

31. Equicontinuity of Families of Mappings with One Normalization Condition

    • E. A. Sevost’yanov
    • S. A. Skvortsov

    Research Articles 06 July 2021 Pages: 614 - 622

    

32. On Differences of Multiplicative Functions and Solutions of the Equation \(n-\varphi(n)=c\)

    • A. S. Semchankau

    Research Articles 06 July 2021 Pages: 623 - 629

33. Reconstruction of a Generalized Fourier Series from Its Sum on a Compact Zero-Dimensional Group in the Non-Abelian Case

    • V. A. Skvortsov

    Research Articles 06 July 2021 Pages: 630 - 637

34. Growth Conditions on a Function and the Error Bound Condition

    • M. V. Balashov

    Short Communications 06 July 2021 Pages: 638 - 643

35. A Note on Singular Equivalences

    • Jian Feng
    • Dejun Wu

    Short Communications 06 July 2021 Pages: 644 - 647

36. A Trick for Calculating Volumes of Non-Euclidean Polyhedra

    • V. A. Krasnov

    Short Communications 06 July 2021 Pages: 648 - 652

    

37. Schwarz’s Lemma and Estimates of Coefficients in the Case of an Arbitrary Set of Boundary Fixed Points

    • O. S. Kudryavtseva

    Short Communications 06 July 2021 Pages: 653 - 657