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Vol. 12(1), 2012 O Princípio Finitista Arquimediano e os Fundamentos da Aritmética: uma introdução à teoria dos aritmos José Carlos Cifuentes Departamento de Matemática Universidade Federal do Paraná, Brasil

Vol. 11(1), 2011 - Revised version - December 30, 2011, new title Some natural generalizations of the Collatz problem Walter Carnielli CLE and Department of Philosophy State University of Campinas - Campinas, Brazil

Vol. 11(5), 2011 Short note on Sacks generic extensions Rodrigo A. Freire Centre for Logic, Epistemology and the History of Science State University of Campinas - Campinas, Brazil

Vol. 11(4), 2011 Lecture notes - Proof theory for contemporary logic by handling polynomials over finite fields Walter Carnielli CLE and Department of Philosophy State University of Campinas - Campinas, Brazil