more from Alfred Tarski

### Single Idea 16295

#### [catalogued under 3. Truth / A. Truth Problems / 2. Defining Truth]

Full Idea

Tarski's Theorem states that under fairly generally applicable conditions, the assumption that there is a definition of truth within a given theory for the language of that same theory leads to a contradiction.

Gist of Idea

Tarski proved that truth cannot be defined from within a given theory

Source

report of Alfred Tarski (The Concept of Truth for Formalized Languages [1933]) by Volker Halbach - Axiomatic Theories of Truth 1

Book Reference

Halbach,Volker: 'Axiomatic Theories of Truth' [CUP 2011], p.4

A Reaction

That might leave room for a definition outside the given theory. I take the main motivation for the axiomatic approach to be a desire to get a theory of truth within the given theory, where Tarski's Theorem says traditional approaches are just wrong.

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Tarski made truth respectable, by proving that it could be defined **[Tarski, by Halbach]**

Idea 14968
A weakened classical language can contain its own truth predicate **[Gupta]**

Idea 14796
Independent truth (if there is any) is the ultimate result of sufficient enquiry **[Peirce]**