1. Automorphism Groups of Computably Enumerable Predicates

   • E. F. Combarro

   OriginalPaper Pages: 285 - 294

2. Partial Results in Δ ₃ ⁰ -Categoricity in Linear Orderings and Boolean Algebras

   • Ch. F. D. McCoy

   OriginalPaper Pages: 295 - 305

3. The Congruence Property of AT-Groups

   • E. L. Pervova

   OriginalPaper Pages: 306 - 313

4. Decidable Computable A-Numberings

   • V. G. Puzarenko

   OriginalPaper Pages: 314 - 322

5. Barwise's Information Frames and Modal Logics

   • V. V. Rybakov

   OriginalPaper Pages: 323 - 336

6. Decidability of Hierarchies of Regular Aperiodic Languages

   • V. L. Selivanov

   OriginalPaper Pages: 337 - 348

7. Sessions of the Seminar “Algebra i Logika”

   OriginalPaper Pages: 349 - 349