LOCAL CLUB CONDENSATION AND L-LIKENESS
LOCAL CLUB CONDENSATION AND L-LIKENESS
复制标题
当地俱乐部的凝结和l-likeness
DOI:
10.1017/jsl.2015.6
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发表时间:
2015-12
影响因子:
0.6
通讯作者:
Wu Liuzhen
中科院分区:
文献类型:
--
作者:
Holy Peter;Welch Philip;Wu Liuzhen
Abstract We present a forcing to obtain a localized version of Local Club Condensation, a generalized Condensation principle introduced by Sy Friedman and the first author in [3] and [5]. This forcing will have properties nicer than the forcings to obtain this localized version that could be derived from the forcings presented in either [3] or [5]. We also strongly simplify the related proofs provided in [3] and [5]. Moreover our forcing will be capable of introducing this localized principle at κ while simultaneously performing collapses to make κ become the successor of any given smaller regular cardinal. This will be particularly useful when κ has large cardinal properties in the ground model. We will apply this to measure how much L-likeness is implied by Local Club Condensation and related principles. We show that Local Club Condensation at κ+ is consistent with ¬☐κ whenever κ is regular and uncountable, generalizing and improving a result of the third author in [14], and that if κ ≥ ω2 is regular, CC(κ+) - Chang’s Conjecture at κ+ - is consistent with Local Club Condensation at κ+, both under suitable large cardinal consistency assumptions.
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