Pairwise Disjoint;
Initial Segment;
Regular Cardinal;
Force Notion;
Independent Family;
D O I:
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摘要:
We answer a question of Shelah and Steprāns [6] by producing a model of ZFC where there are no strongly separable almost disjoint families. The notion of a strongly separable almost disjoint family is a natural variation on the well known notion of a completely separable almost disjoint family, and is closely related to the metrization problem for countable Fréchet groups.
机构:
Univ Wisconsin, Dept Math, Madison, WI 53706 USAUniv Wisconsin, Dept Math, Madison, WI 53706 USA
Kastermans, Bart
Steprans, Juris
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机构:
York Univ, Dept Math, Toronto, ON M3J 1P3, CanadaUniv Wisconsin, Dept Math, Madison, WI 53706 USA
Steprans, Juris
Zhang, Yi
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机构:
Sun Yat Sen Univ, Inst Log & Cognit, Guangzhou 510275, Guangdong, Peoples R China
Sun Yat Sen Univ, Dept Math, Guangzhou 510275, Guangdong, Peoples R ChinaUniv Wisconsin, Dept Math, Madison, WI 53706 USA