1. Convexities of partial monounary algebras

   • D. Jakubíková-Studenovská

   OriginalPaper 27 February 2009 Pages: 125 - 143

2. Some ring-theoretic properties of almost P-frames

   • Themba Dube

   OriginalPaper 27 February 2009 Pages: 145 - 162

3. Terms that are self-dual in Boolean algebras but not in MO₂

   • David Kelly
   • R. Padmanabhan

   OriginalPaper 10 February 2009 Pages: 163 - 168

4. Lower and upper regularizations of frame semicontinuous real functions

   • Javier Gutiérrez García
   • Tomasz Kubiak
   • Jorge Picado

   OriginalPaper 27 February 2009 Pages: 169 - 184

5. Orthocomplemented lattices with a symmetric difference

   • Milan Matoušek

   OriginalPaper 27 February 2009 Pages: 185 - 215

6. The product of two von Neumann n-frames, its characteristic, and modular fractal lattices

   • Gábor Czédli

   OriginalPaper 10 February 2009 Pages: 217 - 230

7. Primitive positive clones of groupoids

   • John W. Snow

   OriginalPaper 27 February 2009 Pages: 231 - 237

8. Lyndon’s groupoid generates a small almost Cross variety

   • Edmond W. H. Lee

   OriginalPaper 10 February 2009 Pages: 239 - 246