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Compact factors in finally compact products of topological spaces

机译:拓扑空间的最终紧致产品中的紧致因子

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摘要

We present instances of the following phenomenon: if a product of topological spaces satisfies some given compactness property then the factors satisfy a stronger compactness property, except possibly for a small number of factors. The first known result of this kind, a consequence of a theorem by A.H. Stone, asserts that if a product is regular and Lindeloef then all but at most countably many factors are compact. We generalize this result to various forms of final compactness, and extend it to two-cardinal compactness. In addition, our results need no separation axiom.
机译:我们提出以下现象的实例:如果拓扑空间的乘积满足某些给定的紧实性,则除少数因素外,这些因子满足更强的紧实性。此类最早的已知结果是A.H. Stone的一个定理得出的结论,它断言,如果一个产品是正规的,并且是Lindeloef,那么除了几乎可数之外的所有因素都是紧凑的。我们将此结果推广到各种形式的最终紧实度,并将其扩展到两基紧实度。另外,我们的结果不需要分离公理。

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