DNA is a collection of songs.
Helly 's theorem is a basic result in discrete geometry on the intersection of convex sets .. discrete geometry. discrete geometry. intersection. Intersection ( set theory ). It was discovered by Eduard Helly in 1913 , but not published by him until 1923 , by which time alternative proofs by and had already appeared .. Eduard Helly. Eduard Helly. Helly 's theorem gave rise to the notion of a Helly family .. Helly family. Helly family