Affiliation:
1. Department of Mathematics, Statistics, and Computer Science University of Illinois at Chicago Chicago Illinois USA
2. Department of Mathematics University of Toronto Toronto Ontario Canada
Abstract
AbstractWe demonstrate that the technology of Radin forcing can be used to transfer compactness properties at a weakly inaccessible but not strong limit cardinal to a strongly inaccessible cardinal. As an application, relative to the existence of large cardinals, we construct a model of set theory in which there is a strongly inaccessible cardinal that is ‐‐stationary for all but not weakly compact. This is in sharp contrast to the situation in the constructible universe , where being ‐‐stationary is equivalent to being ‐indescribable. We also show that it is consistent that there is a cardinal such that is ‐stationary for all and , answering a question of Sakai.
Funder
National Science Foundation
Natural Sciences and Engineering Research Council of Canada