Contents

Differential Equations


Vol. 62, No. 2, 2026


ORDINARY DIFFERENTIAL EQUATIONS

On the Baire Class of the Lower Vinograd Exponent Considered as a Function of a Real Parameter

A. N. Vetokhin p. 225  abstract

Analysis of a Competition Model in the Chemostat with Allelopathy and Wall Growth

F. Borsali p. 232  abstract

On a Necessary Condition of Convergence of Spectral Expansions

A. S. Makin p. 246  abstract


PARTIAL DIFFERENTIAL EQUATIONS

Existence Theorem for a Weak Solution of a Feedback Control Problem for the Kelvin–Voigt Model with the Smoothed Jaumann Time Derivative

V. G. Zvyagin, A. V. Zvyagin, and M. V. Turbin p. 255  abstract

Acoustic Tomography Problem with Memory

V. G. Romanov p. 273  abstract

Homogenization of the Riemann–Hilbert Problem for the Generalized Beltrami Equation with Local Boundary Conditions

M. M. Sirazhudinov and M. G. Ibragimov p. 282  abstract

The Existence of a Global Solution of the Cauchy Problem and Blow Up of the Solution for the Nonlinear Mindlin–Hermann Equation of Longitudinal Vibrations of a Rod

Kh. G. Umarov p. 299  abstract

On the Existence and Absence of Solutions of a Boundary Value Problem for a Fourth-Order Nonlinear Hyperbolic System

S. S. Kharibegashvili and B. G. Midodashvili p. 322  abstract

Nonlocal Problems with Integral Condition for Mixed-Type Equation with Singular Coefficients

N. V. Zaitseva p. 334  abstract


CONTROL THEORY

Global Controllability of a Semilinear Evolution Equation with a Nonstationary Unbounded Operator

A. V. Chernov p. 352  abstract


SHORT COMMUNICATIONS

The Curvatures of Trajectories of Linear Autonomous Systems are Sign-Constant

A. A. Azamov p. 372  abstract

Behavior of Solutions of a Degenerate Ordinary Differential Equation with Increasing Spectral Parameter

B. Yu. Irgashev p. 376  abstract