Topological spaces with the Freese–Nation property
Abstract
We give a proposal of generalization of the Freese–Nation property for topological spaces. We introduce a few properties related to Freese–Nation property: FNS, FN, FNS*, FNI. This article presents some relationship between these concepts. We show that spaces with the FNS property satisfy ccc and any product of such spaces also satisfies ccc. We show that all metrizable spaces have the FN property.
Keywords
FNS property; an inverse limit; openly generated space; ccc
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Instytut Matematyki, Uniwersytet Jana Kochanowskiego w Kielcach oraz Instytut Matematyki, Uniwersytet Śląski w Katowicach Poland
Instytut Matematyki, Uniwersytet Śląski w Katowicach Poland
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