Fibrilação de logicas na hierarquia de Leibniz
AUTOR(ES)
Victor Leandro Fernandez
DATA DE PUBLICAÇÃO
2005
RESUMO
ln this thesis we investigate, with an abstract approach, a process of combinations of logics known as fibring of logics. ln particular we study the transference by fibring of certain properties, intrinsic to propositionallogics: protoalgebricity, equivalenciality and algebraizability. The notions above belong to the "Leibniz Hierarchy", a fundamental concept of the so-called Abstract Algebraic Logic. Such hierarchy classifies the logics according to its algebraizability degree. So, in this thesis we will study whether, given two logics having some of these properties, the fibring of them still has that property. With the aim of distinguishing the different techniques of fibring existing in the literature, we analyze two methods of fibring logics: Categorial Fibring (or C-fibring) and Fibring in D. Gabbay s sense (G-fibring). We also study a variant of G-fibring known as fusion of logics. So, we give different conditions that must hold in order to obtain a protoalgebraic logic by means of C-fibring of protoalgebric logics. We proceed in a similar way with the other properties that constitutes the Leibniz Hierarchy. With respect to G-fibring and fusion, we arrive to similar results which allow us to get an overview of the relation between Abstract AIgebraic Logic and the subject of combinations of logics
ASSUNTO(S)
logic algebraic nonclassical mathematical logic matrizes (matematica) logic multivalued logica algebrica algebra matrix logica a multiplos valores logica matematica não-classica
