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On axiom schemes for T-provably $${\Delta_{1}}$$ Δ 1 formulas

On axiom schemes for T-provably $${\Delta_{1}}$$ Δ 1 formulas 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archive for Mathematical Logic Springer Journals

On axiom schemes for T-provably $${\Delta_{1}}$$ Δ 1 formulas

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References (39)

Publisher
Springer Journals
Copyright
Copyright © 2014 by Springer-Verlag Berlin Heidelberg
Subject
Mathematics; Mathematical Logic and Foundations; Mathematics, general; Algebra
ISSN
0933-5846
eISSN
1432-0665
DOI
10.1007/s00153-014-0368-9
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Archive for Mathematical LogicSpringer Journals

Published: Jan 24, 2014

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