1. A Weighted Version of the Jump Number Problem on Two-Dimensional Orders is NP-Complete

   • Stéphan Ceroi

   OriginalPaper Pages: 1 - 11

2. A Distributive Lattice on the Set of Perfect Matchings of a Plane Bipartite Graph

   • Peter Che Bor Lam
   • Heping Zhang

   OriginalPaper Pages: 13 - 29

3. Embedding Finite Lattices into Finite Biatomic Lattices

   • Kira Adaricheva
   • Friedrich Wehrung

   OriginalPaper Pages: 31 - 48

4. Simple Inductive Proofs of the Fishburn and Mirkin Theorem and the Scott–Suppes Theorem

   • Barry Balof
   • Kenneth Bogart

   OriginalPaper Pages: 49 - 51

5. On the Cofinality of Infinite Partially Ordered Sets: Factoring a Poset into Lean Essential Subsets

   • Reinhard Diestel
   • Oleg Pikhurko

   OriginalPaper Pages: 53 - 66

6. Congruences and Ideals of Effect Algebras

   • Anna Avallone
   • Paolo Vitolo

   OriginalPaper Pages: 67 - 77

7. Posets Generated by Irreducible Elements

   • Marcel Erné
   • Branimir Šešelja
   • Andreja Tepavčević

   OriginalPaper Pages: 79 - 89