Logic Colloquium 2004

0. Introduction; 1. Abstract elementary classes: some answers, more questions John T. Baldwin; 2. On the density of Hausdorff ultrafilters Tomek Bartoszynski and Saharon Shelah; 3. Zero groups and maximal tori Alessandro Berarducci; 4. Constructive set theory with operations A. Cantini and L. Crosilla; 5. Parametrized local zeta functions Raf Cluckers; 6. Colourings of hypergraphs, permutation groups and CSP's Benoit Larose and Lucien Haddad; 7. Congruence, tolerance identities; congruence modularity; shifting principle Paolo Lipparini; 8. Universes in type theory part I - inaccessibles and Mahlo Anton Setzer; 9. Hausdorff dimension and weak truth table reducibility Frank Stephan; 10. Computation and the explanation of intelligent behaviours: ethnologically motivated restart Guglielmo Tamburrini and Edoardo Datteri; 11. Constructible sheaves and definability Ivan Tomasic; 12. An overview of modern universal algebra Ross Willard.