In Alexandre Costa Leite (ed.), Abstract Consequence and Logics - Essays in Honor of Edelcio G. de Souza" edited by A. Costa-Leite. Londres, Royaume-Uni: pp. 245-266 (forthcoming)

Fabien Schang
Universidade Federal de Goiás (PhD)
A analysis of some concepts of logic is proposed, around the work of Edelcio de Souza. Two of his related issues will be emphasized, namely: opposition, and quasi-truth. After a review of opposition between logical systems [2], its extension to many-valuedness is considered following a special semantics including partial operators [13]. Following this semantic framework, the concepts of antilogic and counterlogic are translated into opposition-forming operators [15] and specified as special cases of contradictoriness and contrariety. Then quasi-truth [5] is introduced and equally translated as a product of two partial operators. Finally, the reflections proposed around opposition and quasi-truth lead to a third new logical concept: quasi-opposition, borrowing the central feature of partiality and opening the way to a potential field of new investigations into philosophical logic.
Keywords four-valuedness  logical systems  partial operators  quasi-consequence  quasi-truth  theory of oppositions
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