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An ordinal analysis of stability

An ordinal analysis of stability This paper is the first in a series of three which culminates in an ordinal analysis of Π1 2-comprehension. On the set-theoretic side Π1 2-comprehension corresponds to Kripke-Platek set theory, KP, plus Σ1-separation. The strength of the latter theory is encapsulated in the fact that it proves the existence of ordinals π such that, for all β>π, π is β-stable, i.e. L π is a Σ1-elementary substructure of L β . The objective of this paper is to give an ordinal analysis of a scenario of not too complicated stability relations as experience has shown that the understanding of the ordinal analysis of Π1 2-comprehension is greatly facilitated by explicating certain simpler cases first. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archive for Mathematical Logic Springer Journals

An ordinal analysis of stability

Archive for Mathematical Logic , Volume 44 (1) – Sep 1, 2004

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References (21)

Publisher
Springer Journals
Copyright
Copyright © 2004 by Springer-Verlag Berlin Heidelberg
Subject
Mathematics; Mathematics, general; Algebra; Mathematical Logic and Foundations
ISSN
0933-5846
eISSN
1432-0665
DOI
10.1007/s00153-004-0226-2
Publisher site
See Article on Publisher Site

Abstract

This paper is the first in a series of three which culminates in an ordinal analysis of Π1 2-comprehension. On the set-theoretic side Π1 2-comprehension corresponds to Kripke-Platek set theory, KP, plus Σ1-separation. The strength of the latter theory is encapsulated in the fact that it proves the existence of ordinals π such that, for all β>π, π is β-stable, i.e. L π is a Σ1-elementary substructure of L β . The objective of this paper is to give an ordinal analysis of a scenario of not too complicated stability relations as experience has shown that the understanding of the ordinal analysis of Π1 2-comprehension is greatly facilitated by explicating certain simpler cases first.

Journal

Archive for Mathematical LogicSpringer Journals

Published: Sep 1, 2004

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