Contents

Theoretical and Mathematical Physics

Vol. 228, No. 3, 2026

Research Articles

On the existence, uniqueness, and stability of the limit cycle of the Mackey–Glass equation

V. V. Alekseev p. 1487  abstract

Polynomial isomorphism of the family of parametric Korteweg–de Vries hierarchies

V. M. Buchstaber and E. Yu. Bunkova p. 1494  abstract

Boundary chromatic and flow polynomials: Their combinatorics and physical applications

A. A. Kazakov, E. Yu. Lerner, and S. A. Mukhamedjanova p. 1513  abstract

Analysis of solutions of a second-order differential equation with impulsive delayed feedback

I. S. Kashchenko and I. N. Maslenikov p. 1536  abstract

The problem of front motion with a linear source in an external medium

N. T. Levashova p. 1553  abstract

Front motion in a problem with nonlinear diffusion

A. R. Makhmudov, A. O. Orlov, E. I. Nikulin, and R. L. Argun p. 1565  abstract

Existence and stability of stationary two-dimensional solutions with boundary layers arising in the drift-diffusion model of semiconductors with subDebye dimensions

E. I. Nikulin and A. V. Karamyshev p. 1581  abstract

Asymmetric boundary layers in a singularly perturbed reaction–diffusion–advection problem in a two-dimensional domain

A. O. Orlov, Xiong Zhuxuan, Li Zhiqiang, and V. T. Volkov p. 1600  abstract

Positon excitations in a higher-order Heisenberg ferromagnet

R. U. Rahman, J. He, and Z. Li p. 1613  abstract

Homoclinic manifold splitting and Lyapunov landscape in a dissipative coupled nonlinear Schrödinger system

V. M. Rothos p. 1630  abstract

Indices of some adjacencies of types \(E_7\) and \(E_8\) wavefront singularities

V. D. Sedykh p. 1653  abstract

Simplest solutions to the derivative nonlinear Schrödinger equation with integrable perturbation

A. O. Smirnov, A. S. Marchenko, and A. A. Kaplieva p. 1675  abstract

The Lie–Bianchi integrability of the full symmetric Toda system

Yu. B. Chernyakov, G. I. Sharygin, and D. V. Talalaev p. 1688  abstract