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单词 ConnectedImKleinen
释义

connected im kleinen


A topological spaceMathworldPlanetmath X is connected im kleinen at a point x if every open set U containing x contains an open set V containing x such that if y is a point of V, then there is a connected subset of U containing {x,y}.
Another way to say this is that X is connected im kleinen at a point x if x has a neighborhood base of connected sets (not necessarily open).

A locally connected space is connected im kleinen at each point.

A space can be connected im kleinen at a point but not locally connected at the point.

If a topological space is connected im kleinen at each point, then it is locallyconnected.

References

  • 1 S. Willard, General Topology,Addison-Wesley, Publishing Company, 1970.
  • 2 J.G. Hocking, G.S. Young, Topology, Dover Pubs,1988, republication of 1961 Addison-Wesley edition.
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更新时间:2025/5/26 1:14:09