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Universal Equivalence of Generalized Baumslag–Solitar Groups F. A. Dudkin OriginalPaper 29 November 2020 Pages: 357 - 366
General Recursive Realizability and Basic Logic A. Yu. Konovalov OriginalPaper 29 November 2020 Pages: 367 - 384
Automorphisms of a Graph With Intersection Array {nm − 1, nm− n + m − 1, n − m + 1;1, 1, nm− n + m − 1} A. A. MakhnevM. P. Golubyatnikov OriginalPaper 29 November 2020 Pages: 385 - 394
Axiomatizability of the Class of Subdirectly Irreducible Acts over an Abelian Group A. A. StepanovaD. O. Ptakhov OriginalPaper 29 November 2020 Pages: 395 - 403
Numberings in the Analytical Hierarchy N. A. BazhenovM. MustafaM. M. Yamaleev COMMUNICATIONS 29 November 2020 Pages: 404 - 407
Constructing Punctually Categorical Semigroups I. Sh. Kalimullin OriginalPaper 29 November 2020 Pages: 408 - 411