NDLI: On unfoldable cardinals, ω-closed cardinals, and the beginning of the inner model hierarchy

Content Provider	Springer Nature Link
Author	Welch, P. D.
Copyright Year	2004
Abstract	Let κ be a cardinal, and let H κ be the class of sets of hereditary cardinality less than κ ; let τ (κ) > κ be the height of the smallest transitive admissible set containing every element of {κ}∪H κ . We show that a ZFC-definable notion of long unfoldability, a generalisation of weak compactness, implies in the core model K, that the mouse order restricted to H κ is as long as τ. (It is known that some weak large cardinal property is necessary for the latter to hold.) In other terms we delimit its strength as follows: Theorem Con(ZFC+ω2-Π 1 1-Determinacy) ⇒ ⇒Con(ZFC+V=K+∃ a long unfoldable cardinal ⇒ ⇒Con(ZFC+∀X(X # exists) + ‘‘ $\forall D \subseteq \omega_1 D$ is universally Baire ⇔ ∃r∈R(D∈L(r)))’’, and this is set-generically absolute). We isolate a notion of ω-closed cardinal which is weaker than an ω1-Erd\ os cardinal, and show that this bounds the first long unfoldable: Theorem Let κ be ω -closed. Then there is a long unfoldable ł<κ.
Starting Page	443
Ending Page	458
Page Count	16
File Format	PDF
ISSN	09335846
Journal	Archive for Mathematical Logic
Volume Number	43
Issue Number	4
e-ISSN	14320665
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-03-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Large cardinals Constructibility Inner models Descriptive set theory
Content Type	Text
Resource Type	Article
Subject	Philosophy Logic

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