1. Hybrid bases for varieties of semigroups

   • E. Graczynska
   • D. Schweigert

   Original Paper Pages: 129 - 139

2. Self-dual bases for varieties of orthomodular lattices

   • David Kelly
   • R. Padmanabhan

   Original Paper Pages: 141 - 147

3. Collapsing monoids containing permutations and constants

   • Anne Fearnley
   • Ivo G. Rosenberg

   Original Paper Pages: 149 - 156

4. Near-unanimity is decomposable

   • Luís Sequeira

   Original Paper Pages: 157 - 164

5. Yet another single law for lattices

   • William McCune
   • R. Padmanabhan
   • Robert Veroff

   Original Paper Pages: 165 - 169

6. A Simplicial elimination scheme for ⋀-semidistributive lattices and interval collapsing

   • Philippe Janssen
   • Lhouari Nourine

   Original Paper Pages: 171 - 178

7. Lattice and order properties of the poset of regions in a hyperplane arrangement

   • Nathan Reading

   Original Paper Pages: 179 - 205

8. Archimedeanness and the MacNeille completion of pseudoeffect algebras and po-groups

   • Anatolij Dvurečenskij
   • Thomas Vetterlein

   Original Paper Pages: 207 - 230

9. When an algebraic frame is regular

   • Jorge Martinez
   • Eric R. Zenk

   Original Paper Pages: 231 - 257