Nonproper products

Andrzej Rosłanowski; Saharon Shelah; Otmar Spinas

doi:10.1112/blms/bdr094

Nonproper products

Andrzej Rosłanowski^*
, Saharon Shelah
, Otmar Spinas

^*Corresponding author for this work

Einstein Institute of Mathematics

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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.

Original language	English
Pages (from-to)	299-310
Number of pages	12
Journal	Bulletin of the London Mathematical Society
Volume	44
Issue number	2
DOIs	https://doi.org/10.1112/blms/bdr094
State	Published - Apr 2012

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title = "Nonproper products",

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.",

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Nonproper products

Abstract

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