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Neighborhood System Base


A base for a neighborhood system of a point x is a collection N of open sets such that x belongs to every member of N, and any open set containing x also contains a member of N as a subset.


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Cite this as:

Weisstein, Eric W. "Neighborhood System Base." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NeighborhoodSystemBase.html

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