Boundary point in a metric space ↩

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created: 2021-12-15 14:38:42
modified: 2022-01-10 04:13:04

Let

be a subset of a metric space

.
Then a point

(which may or may not be a point of

) is called a boundary point of

if every neighborhood of

contains at least one point

distinct from

as well as points not belonging to