Boundary Point

A point which is a member of the set closure of a given set S and the set closure of its complement set. If A is a subset of R^n, then a point x in R^n is a boundary point of A if every neighborhood of x contains at least one point in A and at least one point not in A.

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Cite this as:

Weisstein, Eric W. "Boundary Point." From MathWorld--A Wolfram Web Resource.

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