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The main objective of this paper is to show that a certain formulae-as-classes interpretation based on generalized set recursive functions provides a self-validating semantics for Constructive Zermelo-Fraenkel Set theory, CZF. It is argued that this interpretation plays a similar role for CZF as the constructible hierarchy for classical set theory, in that it can be employed to show that CZF is expandable by several forms of the axiom of choice without adding more consistency strength.
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