Vol. 67, No. 2, 2023

Russian Mathematics

Existence Condition for the Eigenvalue of a Three-Particle Schrödinger Operator on a Lattice

J. I. Abdullaev, A. M. Khalkhuzhaev and I. A. Khujamiyorov p. 1 abstract

Lambek Functional Representation of Generalized Symmetric Semirings

E. M. Vechtomov and V. V. Chermnykh p. 23 abstract

Constructive Description of a Class of Periodic Functions on the Real Line

I. Kh. Musin p. 32 abstract

Invariant Almost Contact Structures and Connections on the Lobachevsky Space

A. O. Rastrepina and O. P. Surina p. 43 abstract

Nonautonomous Evolution Equation of Monge–Ampere Type with Two Space Variables

I. V. Rakhmelevich p. 52 abstract

Sharpening of Erdős–Lax Inequality for Polynomials

N. A. Rather, Aijaz Bhat and M. Shafi p. 65 abstract

Existence Results of Neutral Stochastic Partial Dynamic Equations with Stepanov Terms on Time Scales

M. Es-saiydy, M. Zarhouni and M. Zitane p. 73 abstract