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单词 Residual
释义

residual


A subspaceMathworldPlanetmath A of a topological spaceMathworldPlanetmath X is called residual (or comeager) if and only if it is second category and its complement XA is first category. Equivalently, a set is residual if and only if it contains a countableMathworldPlanetmath intersectionMathworldPlanetmath of open (http://planetmath.org/OpenSet) dense sets.

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更新时间:2025/5/4 21:19:46