Coherent adequate forcing and preserving CH
Coherent adequate forcing and preserving CH
复制标题
连贯充分的强迫和保护 CH
DOI:
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发表时间:
2014
影响因子:
0.9
通讯作者:
Miguel Angel Mota
中科院分区:
文献类型:
--
作者:
J. Krueger;Miguel Angel Mota
We develop a general framework for forcing with coherent adequate sets on H(λ) as side conditions, where λ ≥ ω2 is a cardinal of uncountable cofinality. We describe a class of forcing posets which we call coherent adequate type forcings. The main theorem of the paper is that any coherent adequate type forcing preserves CH. We show that there exists a forcing poset for adding a club subset of ω2 with finite conditions while preserving CH, solving a problem of Friedman [Forcing with finite conditions, in Set Theory: Centre de Recerca Matematica, Barcelona, 2003–2004, Trends in Mathematics (Birkhauser-Verlag, 2006), pp. 285–295.].