LOCAL CLUB CONDENSATION AND L-LIKENESS

LOCAL CLUB CONDENSATION AND L-LIKENESS
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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
Wu Liuzhen
中科院分区:
数学3区
文献类型:
--
作者:
Holy Peter;Welch Philip;Wu Liuzhen

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摘要:我们提出了一种强制方法来获得 Local Club Condensation 的本地化版本,这是 Sy Friedman 和第一作者在 [3] 和 [5] 中引入的广义凝结原理。该强制将具有比获得此本地化版本的强制更好的属性,该本地化版本可以从[3]或[5]中提出的强制中派生。我们还大力简化了[3]和[5]中提供的相关证明。此外,我们的强迫将能够在 κ 处引入这种局部原理,同时执行折叠以使 κ 成为任何给定的较小常规基数的后继者。当 κ 在地面模型中具有较大的基本属性时,这将特别有用。我们将用它来衡量本地俱乐部凝聚和相关原则隐含的 L 相似程度。我们证明,每当 κ 是正则且不可数时,κ+ 处的局部俱乐部凝结就与 ØTreeκ 一致,概括并改进了[14]中第三作者的结果,并且如果 κ ≥ ω2 是正则的,则 CC(κ+) - Chang 在 κ+ 处的猜想 - 与 κ+ 处的局部俱乐部凝结一致,两者都在适当的大基数一致性假设下。
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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