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Cardinal preserving elementary embeddings

Published online by Cambridge University Press:  01 March 2011

Françoise Delon
Affiliation:
UFR de Mathématiques
Ulrich Kohlenbach
Affiliation:
Technische Universität, Darmstadt, Germany
Penelope Maddy
Affiliation:
University of California, Irvine
Frank Stephan
Affiliation:
National University of Singapore
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Summary

Abstract. Say that an elementary embedding j : NM is cardinal preserving if CARM = CARN = CAR. We show that if PFA holds then there are no cardinal preserving elementary embeddings j : MV. We also show that no ultrapower embedding j : VM induced by a set extender is cardinal preserving, and present some results on the large cardinal strength of the assumption that there is a cardinal preserving j : VM.

Introduction. This paper is the first of a series attempting to investigate the structure of (not necessarily fine structural) inner models of the set theoretic universe under assumptions of two kinds:

  1. Forcing axioms, holding either in the universe ∨ of all sets or in both ∨ and the inner model under study, and

  2. Agreement between (some of) the cardinals of ∨ and the cardinals of the inner model.

I try to be as self-contained as is reasonably possible, given the technical nature of the problems under consideration. The notation is standard, as in Jech. I assume familiarity with inner model theory; for fine structural background and notation, the reader is urged to consult Steel and Mitchell.

In the remainder of this introduction, I include some general observations on large cardinal theory, forcing axioms, and fine structure, and state the main results of the paper.

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Publisher: Cambridge University Press
Print publication year: 2010

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References

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