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Paper detail

Local collection scheme and end-extensions of models of compositional truth

We introduce a principle of local collection for compositional truth predicates and show that it is conservative over the classically compositional theory of truth in the arithmetical setting. This axiom states that upon restriction to formulae of any syntactic complexity, the resulting predicate satisfies full collection. In particular, arguments using collection for the truth predicate applied to sentences occurring in any given (code of a) proof do not suffice to show that the conclusion of that proof is true, in stark contrast to the case of induction scheme. We analyse various further results concerning end-extensions of models of compositional truth and the collection scheme for the compositional truth predicate.

preprint2020arXivOpen access
Mateusz ŁełykBartosz Wcisło
math.LO
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Mateusz ŁełykBartosz Wcisło

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