16. Boundaries of Euclidean sets
In mathematics in general, and in geometry in particular, there are several concepts of boundaries associated with subsets (in this case of (primarily with n = 2 or 3), the main ones being: the topological boundary, the morphological boundary, the essential boundary, the reduced boundary, and the distributional boundary.
16.1 Topological boundary
Definition (topological boundary). The topological boundary of a subset X of (assumed to be any subset), denoted...
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Boundaries of Euclidean sets
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