4 de outubro 2023 (quarta-feira)

10h30 | Sala 402 e Online

Faculdade de Letras da Universidade do Porto

Sessão 2

Reflective equilibrium and logical pluralism 

| Abílio Rodrigues (UFMG) 

Abstract: The aim of this talk is twofold. First, we present a view of logical pluralism according to which some subclassical logics, equipped with non-classical negations, can coexist peacefully with classical logic because they are characterized as preserving different semantic notions. Intuitionistic logic interpreted in terms of a notion of constructive proof that still accepts non-constructive proofs as legitimate and paraconsistent logics interpreted in terms of preservation of information are perfectly compatible with classical consequence defined in terms of preservation of truth. Second, following D. Prawitz and L. C. Pereira, we argue that the rejection of classically valid inferences by some subclassical logics can be explained by extending to logic the notion of reflective equilibrium. Accordingly, the revision of a logic is a two-way direction process between general logical principles and local reasoning. In order to improve our inferential practices, we reflect on the inferences that are successful and those that are not successful in particular argumentative contexts. In a number of cases, when an inference goes wrong, we notice that some semantic notion has not been transmitted from the premises to the conclusion, and we adjust the inferences that are considered valid in that particular context. Eventually, we may reach a point where a formal system suitable for expressing the deductive behavior of that semantic notion is obtained. (Joint work with Marcos Silva)

Bio: Abilio Rodrigues holds a Ph.D. in Philosophy from the Pontifical Catholic University of Rio de Janeiro. His areas of interest are non-classical logics, in particular paraconsistent and paracomplete logics, and philosophy of logic. He is currently an Associate Professor at the Federal University of Minas Gerais and Associate Researcher at the Centre for Logic and Epistemology at the University of Campinas.

Seminários de Investigação MLAG 2023/2024: https://ifilosofia.up.pt/activities/seminarios-de-investigacao-mlag-2023-2024

Organização:
André Silva
Avelino Costa
João Faria e Silva
José Xarez
Marcondes Rocha Carvalho
Ricardo Serrado
Sâmara Costa
(Estudantes de doutoramento de Filosofia da FLUP)
Mind, Language and Action Group (MLAG)
Instituto de Filosofia da Universidade do Porto – FIL/00502
Fundação para a Ciência e a Tecnologia (FCT)