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A set which is not an interval but is a neighborhood of each of it's points.

Answer»

In topology and related areas of mathematics, a NEIGHBOURHOOD (or neighborhood) is one of the basic concepts in a topological space. ... 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.HOPE IT HELPS YOUStep-by-step EXPLANATION:



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