Nonproper Products
Logic
2014-02-26 v3
Abstract
We show that there exist two proper creature forcings having a simple (Borel) definition, whose product is not proper. We also give a new condition ensuring properness of some forcings with norms.
Keywords
Cite
@article{arxiv.0905.0526,
title = {Nonproper Products},
author = {Andrzej Roslanowski and Saharon Shelah and Otmar Spinas},
journal= {arXiv preprint arXiv:0905.0526},
year = {2014}
}