The logic of pragmatic truth

Newton C.A. Da Costa, Otávio Bueno, Steven French

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


The mathematical concept of pragmatic truth, first introduced in Mikenberg, da Costa and Chuaqui (1986), has received in the last few years several applications in logic and the philosophy of science. In this paper, we study the logic of pragmatic truth, and show that there are important connections between this logic, modal logic and, in particular, Jaskowski's discussive logic. In order to do so, two systems are put forward so that the notions of pragmatic validity and pragmatic truth can be accommodated. One of the main results of this paper is that the logic of pragmatic truth is paraconsistent. The philosophical import of this result, which justifies the application of pragmatic truth to inconsistent settings, is also discussed.

Original languageEnglish (US)
Pages (from-to)603-620
Number of pages18
JournalJournal of Philosophical Logic
Issue number6
StatePublished - 1998
Externally publishedYes


  • Jaskowski's logic
  • Modal logic
  • Paraconsistent logic
  • Partial structures
  • Pragmatic truth
  • Quasi-truth

ASJC Scopus subject areas

  • Philosophy


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