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单词 CompletelyNormal
释义

completely normal


Let X be a topological spaceMathworldPlanetmath. X is said to be if whenever A,BX with AB¯=A¯B=, then there are disjoint open sets U and V such that AU and BV.

Equivalently, a topological space X is if and only if every subspaceMathworldPlanetmath is normal.

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更新时间:2025/5/4 13:12:19