Cardinal preserving ideals
逻辑
2016-09-06 v1
摘要
We give some general criteria, when kappa-complete forcing preserves largeness properties -- like kappa-presaturation of normal ideals on lambda (even when they concentrate on small cofinalities). Then we quite accurately obtain the consistency strength ``NS_lambda is aleph_1-preserving'', for lambda > aleph_2 .
引用
@article{arxiv.math/9605234,
title = {Cardinal preserving ideals},
author = {Moti Gitik and Saharon Shelah},
journal= {arXiv preprint arXiv:math/9605234},
year = {2016}
}