Generalized ordinal analysis and reflection principles in set theory

Hanul Jeon; James Walsh

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arXiv · 2312.12859

Generalized ordinal analysis and reflection principles in set theory

Hanul Jeon·James Walsh

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Abstract

It is widely claimed that the natural axiom systems$\unicode{x2013}$including the large cardinal axioms$\unicode{x2013}$form a well-ordered hierarchy. Yet, as is well-known, it is possible to exhibit non-linearity and ill-foundedness by means of \emph{ad hoc} constructions. In this paper we formulate notions of proof-theoretic strength based on set-theoretic reflection principles. We prove that they coincide with orderings on theories given by the generalized ordinal analysis of Pohlers. Accordingly, these notions of proof-theoretic strength engender genuinely well-ordered hierarchies. The reflection principles considered in this paper are formulated relative to G\"odel's constructible universe; we conclude with generalizations to other inner models.

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BibTeX RIS

Hanul Jeon, James Walsh. 2023-12-20. Generalized ordinal analysis and reflection principles in set theory. https://arxiv.org/abs/2312.12859

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