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arXiv:1902.00895 [math.LO]AbstractReferencesReviewsResources

A note on derivability conditions

Taishi Kurahashi

Published 2019-02-03Version 1

We investigate relationships between versions of derivability conditions for provability predicates. We show several implications and non-implications between the conditions, and we discuss unprovability of consistency statements induced by derivability conditions. Among other things, we improve Buchholz's schematic proof of provable $\Sigma_1$-completeness.

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