Author:
FRIEDMAN SY-DAVID,GITMAN VICTORIA,MÜLLER SANDRA
Abstract
AbstractThe stable core, an inner model of the form
$\langle L[S],\in , S\rangle $
for a simply definable predicate S, was introduced by the first author in [8], where he showed that V is a class forcing extension of its stable core. We study the structural properties of the stable core and its interactions with large cardinals. We show that the
$\operatorname {GCH} $
can fail at all regular cardinals in the stable core, that the stable core can have a discrete proper class of measurable cardinals, but that measurable cardinals need not be downward absolute to the stable core. Moreover, we show that, if large cardinals exist in V, then the stable core has inner models with a proper class of measurable limits of measurables, with a proper class of measurable limits of measurable limits of measurables, and so forth. We show this by providing a characterization of natural inner models
$L[C_1, \dots , C_n]$
for specially nested class clubs
$C_1, \dots , C_n$
, like those arising in the stable core, generalizing recent results of Welch [29].
Publisher
Cambridge University Press (CUP)
Reference31 articles.
1. Some applications of iterated ultrapowers in set theory
2. Beginning Inner Model Theory
3. Large cardinals need not be large in HOD
4. 13 Hamkins, J. D. and Reitz, J. , The set-theoretic universe $V$ is not necessarily a class-forcing extension of HOD, arXiv preprint, 2017, arXiv:1709.06062.
5. Fine Structure and Class Forcing