Sponsored by the Sociedade Brasileira de Logica, Sociedade Brasileira de Matematica, and the Association for Symbolic Logic.

Includes bibliographies.

The scientific work of A. I. Arruda ; Reflection properties induced by some large cardinal axioms ; Taxonometric partitions ; Diamonds, large cardinals, and ultrafilters ; Constantes d'une algebre monadique libre sur une algebre de Boole et automorphismes preservant une partie generatrice de celleci ; Ordered structures in the description of quantum systems: mathematical progress ; Infinities in mathematics and the natural sciences ; The 50th anniversary of Gentzen's thesis ; Logics and pseudogroups ; Sets of relational systems as models for stochastic processes ; A general framework for semantics for propositional logics ; Formal languages and topological spaces ; Automatic theorem proving: an attempt to improve readability of proofs generated by resolution ; The downward LowenheimSkolem theorem for tructures in Omega ets ; The derivative of truth in ukasiewicz sentential calculus ; Equivalence relations on lattices and the complexity of the theory of permutations which commute ; Problem solving by interpretation of theories Newton C A da Costa and Luiz Paulo de Alcantara ; Carlos A Di Prisco and Wiktor Marek ; A Ehrenfeucht M Foreman and J Malitz ; Akihiro Kanamori ; Marcel Guillaume ; Luisa Iturrioz ; Jens Erik Fenstad ; Andres R Raggio ; X Caicedo and AM Sette ; Rolando Chuaqui ; Richard L Epstein ; Jorg Flum ; Edward Hermann Haeusler ; F Miraglia ; Daniele Mundici ; Jacques Stern ; Paulo A S Veloso