1. Bounded query classes and the difference hierarchy

   • Richard Beigel
   • William I. Gasarch
   • Louise Hay

   OriginalPaper Pages: 69 - 84

2. Some uses of dilators in combinatorial problems

   • V. Michele Abrusci

   OriginalPaper Pages: 85 - 109

3. Axiomatization of semigroup consequences

   • Wolfgang Rautenberg

   OriginalPaper Pages: 111 - 123

4. Presheaf semantics and independence results for some non-classical first-order logics

   • Silvio Ghilardi

   OriginalPaper Pages: 125 - 136