Aula Magna 3

Theories of Truth, Rationality, and da Costa’s Quasi-Truth

Otávio Bueno
University of Miami, USA


I will discuss some requirements for a theory of truth and discuss to what extent the leading theories of truth (the correspondence theory, the coherence theory, the pragmatic theory, and the deflationary theory) satisfy, or fail to satisfy, such requirements. I then examine the innovations provided by Newton da Costa’s theory of quasi-truth, and argue that it recommends a significant shift in the assessment of theories of truth. Given the close connection between rationality and truth, I then examine the implications of quasi-truth to the understanding of rationality both in the sciences and in ordinary contexts.