The Logic of Pragmatic Truth
 Newton C. A. da Costa,
 Otávio Bueno,
 Steven French
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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.
 Title
 The Logic of Pragmatic Truth
 Journal

Journal of Philosophical Logic
Volume 27, Issue 6 , pp 603620
 Cover Date
 199812
 DOI
 10.1023/A:1004304228785
 Print ISSN
 00223611
 Online ISSN
 15730433
 Publisher
 Kluwer Academic Publishers
 Additional Links
 Topics
 Keywords

 Jaskowski's logic
 modal logic
 paraconsistent logic
 partial structures
 pragmatic truth
 quasitruth
 Authors

 Newton C. A. da Costa ^{(1)}
 Otávio Bueno ^{(2)}
 Steven French ^{(2)}
 Author Affiliations

 1. Department of Philosophy, University of São Paulo, São PauloSP, 05508900, Brazil (Email: Email
 2. Division of History and Philosophy of Science, Department of Philosophy, University of Leeds, Leeds, LS2 9JT, UK (Email: Email