De Jongh's Theorem for Intuitionistic Zermelo-Fraenkel Set Theory

Published 13 May 2019 in math.LO | (1905.04972v1)

Abstract: We prove that the propositional logic of intuitionistic set theory IZF is intuitionistic propositional logic IPC. More generally, we show that IZF has the de Jongh property with respect to every intermediate logic that is complete with respect to a class of finite trees. The same results follow for CZF.

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Robert Passmann

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