Vol. 68, No. 3, 2024

Russian Mathematics

Integrability of Series with Respect to Multiplicative Systems and Generalized Derivatives

N. Yu. Agafonova and S. S. Volosivets p. 1 abstract

Investigation of the Asymptotics of the Eigenvalues of a Second-Order Quasidifferential Boundary Value Problem

M. Yu. Vatolkin p. 11 abstract

Coefficient Inverse Problem for an Equation of Mixed Parabolic-Hyperbolic Type with a Noncharacteristic Line of Type Change

D. K. Durdiev p. 31 abstract

Classical Solution to the Cauchy Problem for a Semilinear Hyperbolic Equation in the Case of Two Independent Variables

V. I. Korzyuk and J. V. Rudzko p. 41 abstract

Averaging of a Normal System of Ordinary Differential Equations of High Frequency with a Multipoint Boundary Value Problem on a Semiaxis

V. B. Levenshtam p. 53 abstract

Integration of a Sine-Gordon Type Equation with an Additional Term in the Class of Periodic Infinite-Gap Functions

A. B. Khasanov and Kh. N. Normurodov p. 58 abstract

Lower Semicontinuity of Distortion Coefficients for Homeomorphisms of Bounded (1, σ)-Weighted (q, p)-Distortion on Carnot Groups

S. K. Vodopyanov and D. A. Sboev p. 70 abstract

Spectral Relations for a Matrix Model in Fermionic Fock Space

T. Kh. Rasulov and D. E. Ismoilova p. 76 abstract