Sh:941

• Rosłanowski, A., Shelah, S., & Spinas, O. (2012). Nonproper products. Bull. Lond. Math. Soc., 44(2), 299–310. arXiv: 0905.0526 DOI: 10.1112/blms/bdr094 MR: 2914608
• 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.
• Version 2009-05-07_11 (12p) published version (12p)

@article{Sh:941,
 author = {Ros{\l}anowski, Andrzej and Shelah, Saharon and Spinas, Otmar},
 title = {{Nonproper products}},
 journal = {Bull. Lond. Math. Soc.},
 fjournal = {Bulletin of the London Mathematical Society},
 volume = {44},
 number = {2},
 year = {2012},
 pages = {299--310},
 issn = {0024-6093},
 mrnumber = {2914608},
 mrclass = {03E40},
 doi = {10.1112/blms/bdr094},
 note = {\href{https://arxiv.org/abs/0905.0526}{arXiv: 0905.0526}},
 arxiv_number = {0905.0526}
}