1. Constructive and Non-Constructive Infinite Formulas in Computable Structures

   • P. E. Alaev

   OriginalPaper Pages: 219 - 231

2. Necessary Isomorphism Conditions for Rogers Semilattices of Finite Partially Ordered Sets

   • Yu. L. Ershov

   OriginalPaper Pages: 232 - 236

3. The Fixed Point Group of a Free Group Automorphism

   • O. S. Maslakova

   OriginalPaper Pages: 237 - 265

4. Antiadditive Primitive Connected Theories

   • E. A. Palyutin

   OriginalPaper Pages: 266 - 278

5. Convex Subgroups of Partially Right-Ordered Groups

   • A. M. Protopopov

   OriginalPaper Pages: 279 - 286