2181st session. October 19, 2021

S. V. Shpektorov (Birmingham, Great Britain), Axial algebras and their groups (Doctoral dissertation).

2182nd session. November 9, 2021

A. G. Myasnikov (Stevens Institute, Hoboken, USA), Rich structures and weak second-order logic.

2183d session. November 16, 2021

M. E. Goncharov, Rota–Baxter operators on a complete linear Lie algebra of order 2. A connection with solutions for the classical Yang–Baxter equation.

2184th session. December 14, 2021

P. E. Alaev, Complexity of the inversion operations in groups.

R. A. Kornev, Computable reducibility of metrics on the reals (Candidate dissertation).

2185th session. December 21, 2021

F. A. Dudkin, Group and algorithmic properties of generalized Baumslag–Solitar groups (Doctoral dissertation).

2186th session. December 28, 2021

L. Yu. Tsiovkina (Yekaterinburg), Automorphism groups of distance-regular graphs (Doctoral dissertation).

2187th session. February 8, 2022

E. I. Timoshenko, Intersection of centralizers in a partially commutative metabelian group.

Zh. Wang (Hainan, China), A. V. Vasil’ev, M. A. Grechkoseeva, and A. Kh. Zhurtov (Nalchik), A criterion for nonsolvability of a finite group and recognition of direct squares of simple groups.