A proof-theoretic characterization of the primitive recursive set functions

Journal of Symbolic Logic 57 (3):954-969 (1992)
Let KP- be the theory resulting from Kripke-Platek set theory by restricting Foundation to Set Foundation. Let G: V → V (V:= universe of sets) be a ▵0-definable set function, i.e. there is a ▵0-formula φ(x, y) such that φ(x, G(x)) is true for all sets x, and $V \models \forall x \exists!y\varphi (x, y)$ . In this paper we shall verify (by elementary proof-theoretic methods) that the collection of set functions primitive recursive in G coincides with the collection of those functions which are Σ1-definable in KP- + Σ1-Foundation + ∀ x ∃!yφ (x, y). Moreover, we show that this is still true if one adds Π1-Foundation or a weak version of ▵0-Dependent Choices to the latter theory
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DOI 10.2307/2275441
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References found in this work BETA
Andrea Cantini (1985). On Weak Theories of Sets and Classes Which Are Based on Strict ∏11-REFLECTION. Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 31 (21-23):321-332.

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Citations of this work BETA
Justus Diller (2002). Logical Problems of Functional Interpretations. Annals of Pure and Applied Logic 114 (1-3):27-42.

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