1. Randol Maximal Functions and the Integrability of the Fourier Transform of Measures

   • D. I. Akramova
   • I. A. Ikromov

   Research Articles 06 July 2021 Pages: 661 - 678

2. On Changes of Variable that Preserve the Absolute Convergence of Fourier–Haar Series of Continuous Functions

   • K. R. Bitsadze

   Research Articles 06 July 2021 Pages: 679 - 693

3. Density of Smooth Functions in Anisotropic Weighted Sobolev Spaces with Weights that are Locally Bounded and Locally Bounded Away from Zero

   • A. Yu. Golovko

   Research Articles 06 July 2021 Pages: 694 - 701

4. Some Properties of Homogeneous \(\mathcal E\)-Manifolds

   • V. V. Gorbatsevich

   Research Articles 06 July 2021 Pages: 702 - 711

5. Homology of Digraphs

   • A. A. Grigor’yan
   • Yu. V. Muranov
   • R. Jimenez

   Research Articles 06 July 2021 Pages: 712 - 726

   

6. Chromatic Numbers of Distance Graphs without Short Odd Cycles in Rational Spaces

   • Yu. A. Demidovich
   • M. E. Zhukovskii

   Research Articles 06 July 2021 Pages: 727 - 734

7. Inequalities for Eigenvalues of the Sub-Laplacian on Strictly Pseudoconvex CR Manifolds

   • He-Jun Sun

   Research Articles 06 July 2021 Pages: 735 - 747

8. Properties of Neighborhoods of Attractors of Dynamical Systems

   • B. S. Kalitine

   Research Articles 06 July 2021 Pages: 748 - 758

   

9. Solutions of Super-Linear Elliptic Equations and Their Morse Indices

   • Foued Mtiri

   Research Articles 06 July 2021 Pages: 759 - 776

10. New Approach to the Procedure of Quantum Averaging for the Hamiltonian of a Resonance Harmonic Oscillator with Polynomial Perturbation for the Example of the Spectral Problem for the Cylindrical Penning Trap

    • E. M. Novikova

    Research Articles 06 July 2021 Pages: 777 - 793

11. On the Estimates of Periodic Eigenvalues of Sturm–Liouville Operators with Trigonometric Polynomial Potentials

    • C. Nur

    Research Articles 06 July 2021 Pages: 794 - 807

12. Refinement of Estimates of Sums of Sine Series with Monotone Coefficients and Cosine Series with Convex Coefficients

    • A. Yu. Popov

    Research Articles 06 July 2021 Pages: 808 - 818

13. Properties of Monotone Connected Sets

    • I. G. Tsar’kov

    Research Articles 06 July 2021 Pages: 819 - 827

14. Certain Polynomial Stochastic Operators

    • U. U. Jamilov

    Short Communications 06 July 2021 Pages: 828 - 831

15. On Paranormality in Hyperspaces

    • A. P. Kombarov

    Short Communications 06 July 2021 Pages: 832 - 835

16. A Completeness Theorem for the System of Eigenfunctions of the Complex Schrödinger Operator with Potential \(q(x)=cx^\alpha\)

    • S. N. Tumanov

    Short Communications 06 July 2021 Pages: 836 - 839

    

17. On the Growth of the Number of Determinants with Restricted Entries

    • L. M. Arutyunyan

    Research Articles 06 July 2021 Pages: 843 - 848

18. On Classes of Subcompact Spaces

    • V. I. Belugin
    • A. V. Osipov
    • E. G. Pytkeev

    Research Articles 06 July 2021 Pages: 849 - 858

19. Locally Weak Version of the Contraction Mapping Principle

    • Priyam Chakraborty
    • Binayak S. Choudhury

    Research Articles 06 July 2021 Pages: 859 - 866

20. Uniqueness Criterion for the Solution of Boundary-Value Problems for the Abstract Euler–Poisson–Darboux Equation on a Finite Interval

    • A. V. Glushak

    Research Articles 06 July 2021 Pages: 867 - 875

21. On the Approximation of Analytic Functions by Shifts of an Absolutely Convergent Dirichlet Series

    • M. Jasas
    • A. Laurinčikas
    • D. Šiaučiūnas

    Research Articles 06 July 2021 Pages: 876 - 883

22. Cox Rings of Trinomial Hypersurfaces

    • O. K. Kruglov

    Research Articles 06 July 2021 Pages: 884 - 895

23. On Harmonic Polynomials Invariant under Unitary Transformations

    • A. V. Loboda
    • B. M. Darinskii
    • D. V. Kozoriz

    Research Articles 06 July 2021 Pages: 896 - 908

24. Endomorphism of Abelian Groups as Modules over Their Endomorphism Rings

    • O. V. Lyubimtsev

    Research Articles 06 July 2021 Pages: 909 - 917

25. Asymptotics of the Head Wave in the Cauchy Problem for a Difference Scheme Corresponding to the Two-Dimensional Wave Equation with Localized Initial Data

    • S. A. Sergeev

    Research Articles 06 July 2021 Pages: 918 - 931

    

26. Codazzi and Killing Tensors on a Complete Riemannian Manifold

    • S. E. Stepanov
    • I. I. Tsyganok

    Research Articles 06 July 2021 Pages: 932 - 939

27. On Multipliers of Fourier Series in the Haar System

    • N. T. Tleukhanova
    • A. N. Bashirova

    Research Articles 06 July 2021 Pages: 940 - 947

28. Projectively Invariant Subgroups of Abelian \(p\)-Groups

    • A. R. Chekhlov

    Research Articles 06 July 2021 Pages: 948 - 953

29. Smooth Nonprojective Equivariant Completions of Affine Space

    • K. V. Shakhmatov

    Research Articles 06 July 2021 Pages: 954 - 961

    

30. Global Structure of Positive Solutions of Fourth-Order Problems with Clamped Beam Boundary Conditions

    • Dongliang Yan
    • Ruyun Ma
    • Liping Wei

    Research Articles 06 July 2021 Pages: 962 - 970

31. Large Solutions to Elliptic Systems of \(\infty\)-Laplacian Equations

    • Jianduo Yu
    • Feiyao Ma
    • Weifeng Wo

    Research Articles 06 July 2021 Pages: 971 - 979

32. On a Method for Studying the Asymptotics of Solutions of Odd-Order Differential Equations with Oscillating Coefficients

    • N. F. Valeev
    • É. A. Nazirova
    • Ya. T. Sultanaev

    Short Communications 06 July 2021 Pages: 980 - 985

33. Refinement of the Asymptotics of the Number of Labeled Series-Parallel Graphs

    • V. A. Voblyi

    Short Communications 06 July 2021 Pages: 986 - 989

34. Semiclassical Asymptotics for a Difference Schrödinger Equation with Two Coalescent Turning Points

    • A. A. Fedotov

    Short Communications 06 July 2021 Pages: 990 - 994

35. Erratum to: Elementary Theory of the Alexander–Conway Polynomial

    • A. B. Sossinsky

    Erratum 06 July 2021 Pages: 995 - 995