1. On Integral Operators with Homogeneous Kernels and Trigonometric Coefficients

   • O. G. Avsyankin

   OriginalPaper 21 May 2021 Pages: 1 - 7

2. On General Solution of Difference Equations with Constant Coefficients

   • A. A. Baloev
   • P. A. Lazareva

   OriginalPaper 21 May 2021 Pages: 8 - 21

3. Coverings in the Category of Principal Bundles

   • T. A. Gonchar
   • E. I. Yakovlev

   OriginalPaper 21 May 2021 Pages: 22 - 43

4. On the Killing form on Lie Algebras

   • V. V. Gorbatsevich

   OriginalPaper 21 May 2021 Pages: 44 - 60

5. The Tricomi Problem for the Lavrent'ev–Bitsadze Differential-Difference Equation

   • A. N. Zarubin

   OriginalPaper 21 May 2021 Pages: 61 - 71

6. On the Explicit Representation of Polyorthogonal Polynomials

   • A. P. Starovoitov

   OriginalPaper 21 May 2021 Pages: 72 - 80

7. On the Problem of Solvability of Nonlinear Boundary Value Problems for Arbitrary Isotropic Shallow Shells of the Timoshenko Type with Free Edges

   • S. N. Timergaliev

   OriginalPaper 21 May 2021 Pages: 81 - 97