No speedup for geometric theories

Michael Rathjen

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arXiv · 2105.04661

No speedup for geometric theories

Michael Rathjen

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Abstract

Geometric theories based on classical logic are conservative over their intuitionistic counterparts for geometric implications. The latter result (sometimes referred to as Barr's theorem) is squarely a consequence of Gentzen's Hauptsatz. Prima facie though, cut elimination can result in superexponentially longer proofs. In this paper it is shown that the transformation of a classical proof of a geometric implication in a geometric theory into an intuitionistic proof can be achieved in feasibly many steps.

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Michael Rathjen. 2021-05-10. No speedup for geometric theories. https://arxiv.org/abs/2105.04661

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