1. On the Group of Holomorphic Automorphisms of a Model Surface

   • V. K. Beloshapka

   Research Articles 13 September 2021 Pages: 275 - 283

2. Lie Symmetry and Exact Solution of the Time-Fractional Hirota–Satsuma Korteweg–de Vries System

   • H.M. Srivastava
   • H. Mandal
   • B. Bira

   Research Articles 13 September 2021 Pages: 284 - 292

   

3. Arithmetic Properties of an Euler-Type Series with Polyadic Liouville Parameter

   • V. G. Chirskii

   Research Articles 13 September 2021 Pages: 293 - 302

4. The \(p\)-Adic Hausdorff Operator and Some Applications to Hardy–Hilbert Type Inequalities

   • Kieu Huu Dung
   • Dao Van Duong

   Research Articles 13 September 2021 Pages: 303 - 316

5. Billiards with Changing Geometry and Their Connection with the Implementation of the Zhukovsky and Kovalevskaya Cases

   • A. T. Fomenko
   • V. V. Vedyushkina

   Research Articles 13 September 2021 Pages: 317 - 332

   

6. Stability with Respect to Energetic Measures for Biaxial Tension–Compression of a Beam with Rectangular Cross-Section

   • D. V. Georgievskii

   Research Articles 13 September 2021 Pages: 333 - 341

   

7. Some Identities on Truncated Polynomials Associated with Degenerate Bell Polynomials

   • T. Kim
   • D. S. Kim

   Research Articles 13 September 2021 Pages: 342 - 355

8. Continuity Criterion for Locally Bounded Automorphisms of Connected Reductive Lie Groups

   • A. I. Shtern

   Research Articles 13 September 2021 Pages: 356 - 357

9. The Complexities of Nonperturbative Computations

   • Ali Shojaei-Fard

   Research Articles 13 September 2021 Pages: 358 - 376

10. Elliptic \(\mathbb{Z}\)-Operators Associated with the Metaplectic Group

    • P. A. Sipailo
    • K. N. Zhuikov

    Research Articles 13 September 2021 Pages: 377 - 388

11. Stationary Vortex Fluid Motions and the Maximum Principle

    • S. A. Stepin

    Research Articles 13 September 2021 Pages: 389 - 397

12. Properties of Suns in the Spaces \(L^1\) and \(C(Q)\)

    • I. G. Tsar’kov

    Research Articles 13 September 2021 Pages: 398 - 405

13. On Calculating the Coefficients in the Quantum Averaging Procedure for the Hamiltonian of the Resonance Harmonic Oscillator Perturbed by a Differential Operator with Polynomial Coefficients

    • E. M. Novikova

    Research Articles 13 September 2021 Pages: 406 - 410