Cardinal preserving elementary embeddings
Cardinal preserving elementary embeddings
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发表时间:
2010
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通讯作者:
A. Caicedo
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作者:
A. Caicedo
Say that an elementary embedding j : N → M is cardinal preserving if CAR^M =
CAR^N = CAR. We show that if PFA holds then there are no cardinal preserving elementary
embeddings j : M → V. We also show that no ultrapower embedding j : V → M 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 : V → M.