1. Differential Posets and Smith Normal Forms

   • Alexander Miller
   • Victor Reiner

   OriginalPaper 30 July 2009 Pages: 197 - 228

2. On the Complexity of Cover-Incomparability Graphs of Posets

   • Jana Maxová
   • Pavla Pavlíková
   • Daniel Turzík

   OriginalPaper 11 July 2009 Pages: 229 - 236

3. Orders on Subsets Rationalised by Abstract Convex Geometries

   • Walter Bossert
   • Matthew J. Ryan
   • Arkadii Slinko

   OriginalPaper 08 July 2009 Pages: 237 - 244

4. Conditions for Permutability of Congruences in Implication Algebras

   • Diego N. Castaño
   • José Patricio Díaz Varela

   OriginalPaper 15 July 2009 Pages: 245 - 254

5. Unified Representability of Total Preorders and Interval Orders through a Single Function: The Lattice Approach

   • Gianni Bosi
   • Javier Gutiérrez García
   • Esteban Induráin

   OriginalPaper 21 July 2009 Pages: 255 - 275

6. Inductive Characterizations of Finite Interval Orders and Semiorders

   • Jimmy Leblet
   • Jean-Xavier Rampon

   OriginalPaper 18 July 2009 Pages: 277 - 281