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Vol. 13(3), 2013 On the relationship between tetravalent modal algebras, symmetric Boolean algebras and modal algebras for S5 Marcelo E. Coniglio (1); Martín Figallo (2) (1) CLE and Department of Philosophy State University of Campinas Campinas, Brazil (2) Departamento de Matemática Universidad Nacional del Sur Bahía Blanca, Argentina

Vol. 13(2), 2013 Tennant and the AGM Model Epistemic Entrenchment Contraction Diego Fernandes; Wagner Sanz Faculdade de Filosofia Universidade Federal de Goiás - Brasil

Vol. 13(1), 2013 A generalization of Twist-Structures Semantics for n-valued logics Víctor Fernández; Carina Murciano Basic Sciences Institute (Mathematical Area) Philosophy College National University of San Juan  - San Juan, Argentina

Vol. 12(2), 2012 What contradictions say (and what they say not) Walter Carnielli (1); Abílio Rodrigues (2) (1) CLE and Department of Philosophy State University of Campinas - Campinas, Brazil (2) Department of Philosophy Federal University of Minas Gerais - Belo Horizonte, Brazil