Nonproper products
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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| Veröffentlicht in: | The Bulletin of the London Mathematical Society 2012-04, Vol.44 (2), p.299-310 |
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| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | 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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| ISSN: | 0024-6093 1469-2120 |
| DOI: | 10.1112/blms/bdr094 |