Ideals of nowhere Ramsey sets are isomorphic

Journal of Symbolic Logic 59 (2):662-667 (1994)
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Abstract

We introduce a notion of ideal type such that any two ideals with the same ideal type are isomorphic. From this we infer, under the axiom t = h, that each ideal which consists of all nowhere Ramsey sets contained in some family of infinite subsets of natural numbers is isomorphic with the ideal of all nowhere Ramsey sets

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