Source: J. Symbolic Logic Volume 70, Issue 4
(2005), 1233-1254.
This paper proves that the disjunction property, the
numerical existence property, Church’s rule, and
several other metamathematical properties hold true for Constructive
Zermelo-Fraenkel Set Theory, CZF, and also for the
theory CZF augmented by the Regular Extension Axiom.
As regards the proof technique, it features a self-validating
semantics for CZF that combines realizability for
extensional set theory and truth.
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