Contents

Differential Equations

Vol. 61, No. 2, 2025

ORDINARY DIFFERENTIAL EQUATIONS

On the Existence of Periodic Solutions of an Ordinary Second-Order Differential Equation with Parameter and Discontinuous Right-Hand Side under Various Boundary Conditions

O. V. Baskov, and D. K. Potapov p. 139  abstract

Asymptotics of Eigenvalues and Eigenfunctions of the Sturm–Liouville Operator with a Singular Potential on a Star Graph: I

K. P. Zuev p. 154  abstract

On an Analog of the Ambarzumian Theorem

Kh. K. Ishkin p. 169  abstract

On Differential Equations with Even Number of Periodic Solutions

V. S. Klimov p. 181  abstract

A Priori Estimate for Periodic Solutions of a System of Second-Order Ordinary Differential Equations with a Main Positively Homogeneous Nonlinearity

E. Mukhamadiev, and A. N. Naimov p. 191  abstract

On the Spectra of Oscillation Indices of a Two-Dimensional Nonlinear System and Its First Approximation System

A. Kh. Stash p. 198  abstract

On the Asymptotics of Solutions of Ordinary Differential Equations of Odd Order

Ya. T. Sultanaev, B. I. Mardanov, and E. A. Nazirova p. 211  abstract

PARTIAL DIFFERENTIAL EQUATIONS

Poisson Formula for the Solution of the Radial Cauchy Problem for a Singular Ultrahyperbolic Equation

L. N. Lyakhov, and Yu. N. Bulatov p. 218  abstract

NUMERICAL METHODS

Estimating the Local Error of the Explicit Euler Method for the Numerical Solution of the Cauchy Problem for Ordinary Differential Equations Transformed to the Best Argument

E. B. Kuznetsov, and S. S. Leonov p. 230  abstract

SHORT COMMUNICATIONS

On the Existence of a Positive Solution to a Boundary-Value Problem for One Nonlinear Ordinary Differential Equation of the Fourth Order

G. E. Abduragimov p. 248  abstract

The Cauchy Problem for the System of the Moment Theory of Elasticity

O. I. Makhmuddov, and I. E. Niyozov p. 254  abstract