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单词 LindelofTheorem
释义

Lindelöf theorem


If a topological spaceMathworldPlanetmath (X,τ) satisfies the second axiom of countability, and if A is any subset of X, then any open cover for A has a countable subcover.

In particular, we have that (X,τ) is a Lindelöf space (http://planetmath.org/lindelofspace).

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更新时间:2025/5/4 21:42:12