Notes on bounded induction for the compositional truth predicate

Review of Symbolic Logic 10 (3):455-480 (2017)
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Abstract

We prove that the theory of the extensional compositional truth predicate for the language of arithmetic with \Delta 0 -induction scheme for the truth predicate and the full arithmetical induction scheme is not conservative over Peano Arithmetic. In addition, we show that a slightly modified theory of truth actually proves the global reflection principle over the base theory.

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