1. A New Estimate of Double Fourier Coefficients for Functions of Bounded Generalized Variation

   • N. A. Zhukovskii

   OriginalPaper 08 November 2021 Pages: 145 - 153

2. Functions Preserving Metrics, and Gromov–Hausdorff Space

   • V. M. Chikin

   OriginalPaper 08 November 2021 Pages: 154 - 160

3. An Existence Criterion for Maximizers of Convolution Operators in \(\boldsymbol{L}_{\mathbf{1}}\boldsymbol{(\mathbb{R}^{n})}\)

   • G. V. Kalachev
   • S. Yu. Sadov

   OriginalPaper 08 November 2021 Pages: 161 - 167

4. Reduction of a Functional Integral over Discontinuous Trajectories to Integrals over Continuous Trajectories

   • E. S. Kolpakov

   OriginalPaper 08 November 2021 Pages: 168 - 171

5. Action of Free Commuting Involutions on Closed Two-Dimensional Manifolds

   • T. Yu. Neretina

   OriginalPaper 08 November 2021 Pages: 172 - 176

   

6. Orbital Invariants of Flat Billiards Bounded by Arcs of Confocal Quadrics and Containing Focuses

   • V. V. Vedyushkina

   OriginalPaper 08 November 2021 Pages: 177 - 180

   

7. Simplification of the Calculation of Characteristic Frequencies over Nonuniform Scales

   • A. N. Korolev

   OriginalPaper 08 November 2021 Pages: 181 - 185