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单词 Isolated
释义

isolated


Let X be a topological spaceMathworldPlanetmath, let SX, and let xS. The point x is said to be an isolated point of S if there exists an open set UX such that US={x}.

The set S is isolated or discrete if every point in S is an isolated point.

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更新时间:2025/5/4 17:02:35