Neighbourhood (mathematics)
Open set containing a given point / From Wikipedia, the free encyclopedia
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In topology and related areas of mathematics, 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.
Open set containing a given point
in the plane is a neighbourhood of a point 
if a small disc around is contained in 