Wellfoundedness proofs by means of non-monotonic inductive definitions II: first order operators

preprint2010arXivOpen access

Abstract

In this paper, we give two proofs of the wellfoundedness of recursive notation systems for ΠNΠ_N-reflecting ordinals. One is based on ΠN−10Π_{N-1}^0-inductive definitions, and the other is based on distinguished classes.

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