3 English Words With Δ

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Definition:
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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Definition:
In which every geodesic triangle satisfies that every point on the triangle is within a distance of δ of each side of the triangle.
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