1. Lattice problems originating in quadratic space theory

   • Herbert Gross
   • Zdenek Lomecky
   • Reto Schuppli

   OriginalPaper Pages: 267 - 291

2. Nonfinitely based three-element idempotent groupoids

   • J. Ježek

   OriginalPaper Pages: 292 - 301

3. An effective representation for finitely generated free interior algebras

   • Fabio Bellissima

   OriginalPaper Pages: 302 - 317

4. Quasi-affine algebras

   • Robert W. Quackenbush

   OriginalPaper Pages: 318 - 327

5. The Birkhoff Variety Theorem for continuous algebras

   • Jiři Adámek
   • Evelyn Nelson
   • Jan Reiterman

   OriginalPaper Pages: 328 - 350

6. Order theoretic classification of monotone equivariant cluster methods

   • Forrest B. Baulieu

   OriginalPaper Pages: 351 - 367

7. Varieties of orthomodular lattices related to states

   • René Mayet

   OriginalPaper Pages: 368 - 396

8. Discriminator polynomials and arithmetical varieties

   • Stanley Burris

   OriginalPaper Pages: 397 - 399

9. A simple proof of the hereditary undecidability of the theory of lattice-ordered abelian groups

   • Stanley Burris

   OriginalPaper Pages: 400 - 401