1. Quasivariety Generated by Free Metabelian and 2-Nilpotent Groups

   • A. I. Budkin

   OriginalPaper Pages: 213 - 218

2. The Kervaire-Laudenbach Conjecture and Presentations of Simple Groups

   • A. A. Klyachko

   OriginalPaper Pages: 219 - 242

3. Decidability of the Admissibility Problem for Inference Rules in Some S5_t-Logics

   • A. V. Kosheleva

   OriginalPaper Pages: 243 - 255

4. The Property of Being Binary for ℵ₀-Categorical Weakly o-Minimal Theories

   • B. Sh. Kulpeshov

   OriginalPaper Pages: 256 - 263

5. Semilattices of Definable Subalgebras

   • A. G. Pinus

   OriginalPaper Pages: 264 - 269

6. Lattices That are Embeddable in Suborder Lattices

   • M. V. Semenova

   OriginalPaper Pages: 270 - 285