The liar's paradox: technical and philosophical aspects

Authors

DOI:

https://doi.org/10.51359/2357-9986.2020.248953

Keywords:

liar paradox, diagonal lemma, undefinability theorem, gaps, gluts, triviality

Abstract

Our main goal in this text is to provide a critical introduction to the Liar pa-radox, both from a technical point of view, as well as from a philosophical point of view. First, we shall present different versions of the Liar and list important limiting results associated with it, the Diagonal Lemma and Tarski’s Undefinability Theorem. Next, we shall present some of the main approaches to the paradox. Finally, we shall confront them with the same challenge: the apparent impossibility of completely reconciling unlimited ex-pressive power on the one hand and consistency or non-triviality on the other.

Author Biographies

Guilherme Cardoso, Universidade Federal de Ouro Preto

Professor do Departamento de Filosofia da Universidade Federal de Ouro Preto.

Ederson Melo, Universidade Federal do Maranhão

Professor do Departamento de Filosofia da Universidade Federal do Maranhão.

Túlio Aguiar, Universidade Federal de Minas Gerais

Professor do Departamento de Filosofia da Universidade Federal de Minas Gerais.

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Published

2020-11-27

Issue

Section

Número Especial sobre Filosofia da Lógica