Contents

Computational Mathematics and Mathematical Physics

Vol. 66, No. 4, 2026

GENERAL NUMERICAL METHODS

Wavefronts and Caustics of Vector Fields

V. P. Varin p. 609  abstract

GENERAL NUMERICAL METHODS

Modified Quadrature Formulas for a Single-Layer Potential in the Case of a Triangulated Surface

P. A. Krutitskii and I. O. Reznichenko p. 623  abstract

Adaptive Grids and Numerical Algorithms for Solving Stationary and Non-Stationary Problems with a Variable Diffusion Coefficient, Small Parameter and Turning Point

V. D. Liseikin, V. Gupta, S. Karasuljić, and S. K. Sahoo p. 633  abstract

GENERAL NUMERICAL METHODS

Finite Biorthogonal M Matrix Polynomials

E. Güldoğan Lekesiz p. 647  abstract

OPTIMAL CONTROL

The Polyak–Lojasiewicz Condition for a Strongly Convex Function on a Smooth Manifold and Its Application

M. V. Balashov p. 658  abstract

PARTIAL DIFFERENTIAL EQUATIONS

Theoretical and Numerical Analysis of an Inhomogeneous Boundary Value Problem for a Stationary Electron Drift–Diffusion Model

R. V. Brizitskii, N. N. Maksimova, and E. M. Veselova p. 669  abstract

PARTIAL DIFFERENTIAL EQUATIONS

Resonant Signal Reversal in a Waveguide Using a Resonator

A. L. Delitsyn and I. K. Troshina p. 684  abstract

PARTIAL DIFFERENTIAL EQUATIONS

Well-Posedness for a Class of Distributed Order Time-Fractional Navier–Stokes Equations with Damping

K. N. O, H. C. Choe, S. A. Pak, and Y. D. Ri p. 693  abstract

MATHEMATICAL PHYSICS

Accuracy of the Diffusion Approximation in Solving Model Problems of Radiation Transport in a Medium Using Bicompact Schemes

E. N. Aristova and N. I. Karavaeva p. 717  abstract

Mathematical Modeling of Bending of a Thin Orthotropic Rectangular Plate Based on Couple Stress Theory

O. V. Germider and V. N. Popov p. 732  abstract

On the Solution of Boundary Value Problems in Numerical Modeling of a Multi-Core Cable

V. T. Zhukov, N. D. Novikova, and O. B. Feodoritova p. 749  abstract

Numerical Schemes for Solving the Problem of Gas Inflow to a Well System in a Relaxation-Deformable Gas Reservoir

B. Z. Kazymov p. 758  abstract

Numerical Study of the Development of the Richtmyer–Meshkov Instability on the Contact Boundaries of Gas Layers

A. N. Razin, M. I. Polyshchyuk, A. A. Sinel’nikova, Yu. A. Stepanova, and V. V. Zmushko p. 765  abstract

Inviscid Instability of Poiseuille Flow in a Flat Channel with Compliant Walls

I. V. Savenkov p. 785  abstract