1. The theory of A-spaces

   • Yu. L. Ershov

   OriginalPaper Pages: 209 - 232

2. A prevariety of semigroups whose elementary theory is solvable

   • A. P. Zamyatin

   OriginalPaper Pages: 233 - 241

3. On btt-reducibilities. II

   • G. N. Kobzev

   OriginalPaper Pages: 242 - 248

4. Implication lattices

   • L. L. Maksimova

   OriginalPaper Pages: 249 - 261

5. Automorphisms of two-dimensional congruence groups

   • Yu. I. Merzlyakov

   OriginalPaper Pages: 262 - 267

6. Solvability of (−1, 1) nil rings

   • R.É Roomel'di

   OriginalPaper Pages: 268 - 274

7. Sessions of the "algebra and logic" seminar

   Events Pages: 275 - 275