1. An infinite order operator on the lattice of varieties of completely regular semigroups

   • S. Zhang

   OriginalPaper Pages: 485 - 505

2. The structure of solid binary algebras

   • R. Broeksteeg

   OriginalPaper Pages: 506 - 523

3. Equivalential algebras. Part I: Representation

   • K. SŁomczyńska

   OriginalPaper Pages: 524 - 547

4. Hypergraphs and hypergroups

   • P. Corsini

   OriginalPaper Pages: 548 - 555

5. Universal categories of uniform and metric locales

   • B. Banaschewski
   • A. Pultr

   OriginalPaper Pages: 556 - 569

6. Morita equivalence of quasi-primal algebras and sheaves

   • G. Gierz

   OriginalPaper Pages: 570 - 576

7. A Reiterman theorem for pseudovarieties of finite first-order structures

   • J. -E. Pin
   • P. Weil

   OriginalPaper Pages: 577 - 595