1. On Algorithmic Problems for Joins of Pseudovarieties

   • B. Steinberg

   OriginalPaper 26 February 2013 Pages: 1 - 40

2. Centralizers and Central Idempotents of Semigroup Rings

   • Y. Chen

   OriginalPaper 26 February 2013 Pages: 41 - 52

3. On Definability of Hypergraphs by Their Semigroups of Homomorphisms

   • A.V. Molchanov

   OriginalPaper 26 February 2013 Pages: 53 - 65

4. Commutative Nilsemigroups with Zero Cohomology

   • P.A. Grillet

   OriginalPaper 26 February 2013 Pages: 66 - 78

5. Presentations of Bruck-Reilly Extensions and Decision Problems

   • A. Yamamura

   OriginalPaper 26 February 2013 Pages: 79 - 97

6. A Compact Monothetic Semitopological Semigroup Whose Set of Idempotents Is Not Closed

   • A. Bouziad
   • M. Lemańczyk
   • M. K. Mentzen

   OriginalPaper 26 February 2013 Pages: 98 - 102

7. The Berman Conjecture Is True for Finite Surjective Semigroups and Their Inflations

   • S. Crvenković
   • I. Dolinka
   • N. Ruškuc

   OriginalPaper 26 February 2013 Pages: 103 - 114

8. Lattice Isomorphisms of Completely 0 -Simple Semigroups

   • A. J. Ovsyannikov

   OriginalPaper 26 February 2013 Pages: 115 - 145

9. On the Index of Nilpotency of Semigroup Graded Rings

   • H. Gopalakrishnan

   OriginalPaper 26 February 2013 Pages: 146 - 158