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单词 HomeomorphismsPreserveConnectedComponents
释义

homeomorphisms preserve connected components


Let X,Y be topological spacesMathworldPlanetmath and X=Xi, Y=Yj be decompositions into connected componentsMathworldPlanetmathPlanetmathPlanetmathPlanetmath.

PropositionPlanetmathPlanetmath. Assume that f:XY is a homeomorphismPlanetmathPlanetmath. Then for any i there exists j such that f(Xi)=Yj.

Proof. Take any i. Because f is continuousPlanetmathPlanetmath f(Xi) is connected, then there exists j such that f(Xi)Yj (because Yj is a connected component). Now f is a homeomorphism, f-1(Yj)Xi, Yj is connected and Xi is a connected component, so f-1(Yj)Xi. Thus Yjf(Xi), which completesPlanetmathPlanetmathPlanetmathPlanetmathPlanetmathPlanetmathPlanetmath the proof.

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更新时间:2025/5/4 20:43:30