Classical Grounded Truth
Axiomatic theories of truth take truth as an undefined primitive predicate and aim to axiomatically characterize it. If the truth predicate can operate on sentences (or other truth-bearers) involving the truth predicate itself, then it is called self-applicable (or type-free). Because of the Liar paradox, the naive axiomatization of self-applicable truth is inconsistent, and a variety of restrictions of the naive axioms have been proposed, which result in a plethora of theories of truth. Most of those theories abandon the classical bivalent notion of truth and instead adopt a non-classical notion of truth. However, this move to non-classical truth cripples some important logico-linguistic functions of truth and seems to pose a considerable limitation on the applicability of truth in philosophy and other areas. In this talk, Fujimoto presents a new type of theory of truth that is self-applicable, thoroughly classical, mathematically sound, and with rich mathematical consequences. The main part of this talk is a joint work with Volker Halbach.
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