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arXiv:1904.11168 [math.LO]AbstractReferencesReviewsResources

Properness under closed forcing

Yasuo Yoshinobu

Published 2019-04-25Version 1

For every uncountable regular $\kappa$, we give two examples of proper posets which turn improper in some $\kappa$-closed forcing extension.

Comments: 7 pages
Categories: math.LO
Subjects: 03E40, 03E57
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