Gleason's theorem
In mathematics, the ε-neighborhood (or epsilon-neighborhood) of a set A ⊆ M, where (M, d) is a metric space, is the set of all points of M whose distance to some point of A is less than ε > 0.[1] It is customarily denoted by Aε. One may write
where Bε(p) is the open ball of radius ε centered at a point p of M.
References
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