Semimorasses and Nonreflection at Singular Cardinals

Semimorasses and Nonreflection at Singular Cardinals
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奇异基数的半沼泽和不思考

DOI:
10.1016/0168-0072(93)e0068-y
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发表时间:
1995
期刊:
Ann. Pure Appl. Log.
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通讯作者:
P. Koszmider
P. Koszmider
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作者:
P. Koszmider

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研究了κ(λ)的一些亚族,对于κ正则,κ≤λ,称为(κ, λ)-半蜜。对于λ = κ+,它们构成Velleman简化的(κ, 1)-泥淖的弱版本,对于λ > κ+,它们提供了一个组合框架,在某些情况下具有与(κ, 1)-泥淖应用类似的应用,其区别在于获得的对象的大小为λ大于或等于κ+,而不仅仅是泥淖中的大小为κ+。新的一致性结果涉及(兼容CH)不可数共度的奇异大小的非反射对象的存在性,如Pκ(λ)中的非反射平稳集,大小为λ的非反射非度量空间,大小为λ的非反射非特殊树。我们还描述了没有不可数分支的非特殊树的可能最小尺寸。
Some subfamilies of Pκ(λ), for κ regular, κ ⩽ λ, called (κ, λ)-semimorasses are investigated. For λ = κ+, they constitute weak versions of Velleman's simplified (κ, 1)-morasses, and for λ > κ+, they provide a combinatorial framework which in some cases has similar applications to the application of (κ, 1)-morasses with this difference that the obtained objects are of size λ ⩾ κ+, and not only of size κ+as in the case of morasses. New consistency results involve (compatible with CH) existence of nonreflecting objects of singular sizes of uncountable cofinality such as a nonreflecting stationary set in Pκ(λ), a nonreflecting nonmetrizable space of size λ, a nonreflecting nonspecial tree of size λ. We also characterize possible minimal sizes of nonspecial trees without uncountable branches.
T.Shoji:“有限域上还原群的绿色函数),收录于 AMS 夏季研究所阿卡塔会议记录”美国数学。
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