Two remarks on proof theory of first-order arithmetic

preprint2020arXivOpen access

Abstract

In this note let us give two remarks on proof-theory of PA. First a derivability relation is introduced to bound witnesses for provable Σ1Σ_{1}-formulas in PA. Second Paris-Harrington's proof for their independence result is reformulated to show a `consistency' proof of PA based on a combinatorial principle.

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