δ-box

Noun. (analysis) A ''k''-cell which is a Cartesian product of half-closed intervals which are closed at their infima and open at their suprema, and such that the infimum of each interval is the coordinate of a given point (called "the corner" of the ''δ''-box), and the length (i.e., measure) of each interval is equal to (the given value) ''δ''.

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This entry was last updated on RefTopia from its source on 3/20/2012.