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(2022)
Models of Arithmetic
This paper investigates the status of the fragments of Peano Arithmetic obtained by restricting induction, collection and least number axiom schemes to formulas which are $${\Delta_1}$$ Δ 1 provably in an arithmetic theory T. In particular, we determine the provably total computable functions of this kind of theories. As an application, we obtain a reduction of the problem whether $${I\Delta_0 + \neg \mathit{exp}}$$ I Δ 0 + ¬ exp implies $${B\Sigma_1}$$ B Σ 1 to a purely recursion-theoretic question.
Archive for Mathematical Logic – Springer Journals
Published: Jan 24, 2014
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