Neighbourhood (mathematics)
Open set containing a given point
Neighbourhood (mathematics)
In topology and mathematical analysis, a neighbourhood (or neighborhood) is one of the basic concepts in a topological space. It is closely related to the concepts of open set and interior. Intuitively speaking, a neighbourhood of a point is a set of points containing that point where one can move some amount in any direction away from that point without leaving the set.
Read on Wikipedia · Image Oleg Alexandrov, Public domain
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