1. Some Remarks on High Degree Polynomial Integrals of the Magnetic Geodesic Flow on the Two-Dimensional Torus

   • S. V. Agapov
   • A. A. Valyuzhenich
   • V. V. Shubin

   OriginalPaper 06 August 2021 Pages: 581 - 585

2. Separated Lattices of Multiply \( \sigma \)-Local Formations

   • N. N. Vorob’ev
   • I. I. Staselka
   • A. Hojagulyyev

   OriginalPaper 06 August 2021 Pages: 586 - 597

3. Horizontal Joinability in Canonical 3-Step Carnot Groups with Corank 2 Horizontal Distributions

   • A. V. Greshnov
   • R. I. Zhukov

   OriginalPaper 06 August 2021 Pages: 598 - 606

4. On Unconditional and Absolute Convergence of the Haar Series in the Metric of \( L^{p}[0,1] \) with \( 0<p<1 \)

   • M. G. Grigoryan

   OriginalPaper 06 August 2021 Pages: 607 - 615

5. The Subspace of Almost Convergent Sequences

   • R. E. Zvolinskii
   • E. M. Semenov

   OriginalPaper 06 August 2021 Pages: 616 - 620

6. Intersections of Three Nilpotent Subgroups in a Finite Group

   • V. I. Zenkov

   OriginalPaper 06 August 2021 Pages: 621 - 637

7. A One-Parametric Method for Determining Parameters in the Schwarz–Christoffel Integral

   • I. A. Kolesnikov

   OriginalPaper 06 August 2021 Pages: 638 - 653

   

8. On a Lemma Arising in the Solution of Waring’s Problem

   • S. V. Konyagin
   • V. Yu. Protasov

   OriginalPaper 06 August 2021 Pages: 654 - 656

9. About the Limit Spectra of Some Unbounded Selfadjoint Integral Operators

   • V. B. Korotkov

   OriginalPaper 06 August 2021 Pages: 657 - 660

10. Refinement of the Relations between Mixed Smoothness Moduli in \( L_{1} \) and \( L_{q} \) Metrics

    • M. K. Potapov
    • B. V. Simonov

    OriginalPaper 06 August 2021 Pages: 661 - 677

11. Central Isotopes of \( (-1,1) \)-Algebras

    • S. V. Pchelintsev

    OriginalPaper 06 August 2021 Pages: 678 - 690

12. Intrinsic Geometry and Boundary Structure of Plane Domains

    • O. Rainio
    • T. Sugawa
    • M. Vuorinen

    OriginalPaper 06 August 2021 Pages: 691 - 706

    

13. On the Isomorphism of Sobolev-Type Classes on Metric Spaces

    • A. S. Romanov

    OriginalPaper 06 August 2021 Pages: 707 - 718

14. The Root-Class Residuality of the Fundamental Groups of Graphs of Groups

    • E. V. Sokolov

    OriginalPaper 06 August 2021 Pages: 719 - 729

15. Interval Extensions of Orders and Temporal Approximation Spaces

    • A. I. Stukachev

    OriginalPaper 06 August 2021 Pages: 730 - 741

16. On the Decomposition of Partially Commutative Groups of Varieties and Their Defining Graphs

    • E. I. Timoshenko

    OriginalPaper 06 August 2021 Pages: 742 - 746

17. A Multivalued History-Dependent Operator and Implicit Evolution Inclusions. II

    • A. A. Tolstonogov

    OriginalPaper 06 August 2021 Pages: 747 - 762

18. A Separation Property of the Observer-Based Stabilizing Controller for Linear Delay Systems

    • G. D. Hu

    OriginalPaper 06 August 2021 Pages: 763 - 772