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Ramsey-like cardinals II

Publisher: Cambridge University Press

E-ISSN: 1943-5886|76|2|541-560

ISSN: 0022-4812

Source: The Journal of Symbolic Logic, Vol.76, Iss.2, 2011-06, pp. : 541-560

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Abstract

This paper continues the study of the Ramsey-like large cardinals introduced in [5] and [14]. Ramsey-like cardinals are defined by generalizing the characterization of Ramsey cardinals via the existence of elementary embeddings. Ultrafilters derived from such embeddings are fully iterable and so it is natural to ask about large cardinal notions asserting the existence of ultrafilters allowing only α-many iterations for some countable ordinal α. Here we study such α-iterable cardinals. We show that the α-iterable cardinals form a strict hierarchy for αω 1, that they are downward absolute to L for , and that the consistency strength of Schindler's remarkable cardinals is strictly between 1-iterable and 2-iterable cardinals.