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单词 ExampleOfASemilocallySimplyConnectedSpaceWhichIsNotLocallySimplyConnected
释义

example of a semilocally simply connected space which is not locally simply connected


Let HR be the Hawaiian rings, and define X to be the cone over HR. Then, X is connectedPlanetmathPlanetmath, locally connected, and semilocally simply connected, but not locally simply connected.

Too see this, let pHR be the point to which the circles converge in HR, and represent X as HR×[0,1]/HR×{0}. Then, every small enough neighborhoodMathworldPlanetmathPlanetmath of q:=(p,1)X fails to be simply connected. However, since X is a cone, it is contractible, so all loops (in particular, loops in a neighborhood of q) can be contracted to a point within X.

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更新时间:2025/5/4 23:02:52