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helly
(obsolete) Hellish, infernal.
Helly's theorem
(geometry) A basic result in discrete geometry on the intersection of convex sets, which gave rise to the notion of a Helly family.
Helly dimensions
plural of Helly dimension
Helly dimension
(combinatorics) A value associated with a metric space, being one less than the Helly number of the family of metric balls in that space.
rake-helly
Alternative form of rakehelly
Helly family
(combinatorics) A family of order k of sets, such that any minimal subfamily with an empty intersection has k or fewer sets in it.
Helly families
plural of Helly family
Helly's selection theorem
(mathematics) A theorem stating that a sequence of functions that is locally of bounded total variation and uniformly bounded at a point has a convergent subsequence.
Helly-Bray theorem
(probability) A theorem relating the weak convergence of cumulative distribution functions to the convergence of expectations of certain measurable functions.