Linked from

The 5 pages that link to Helly's theorem, each with the reason it gives.

• Convex geometryRelated: It converts local intersection conditions into a global one.

• Carathéodory's theoremRelated: Its standard proof applies Carathéodory's theorem to separating convex combinations.

• Radon's theoremRelated: Radon's partition argument is a standard route to Helly's theorem.

• Kirszbraun theoremRelated: Finite ball intersections underpin a standard proof of the extension step.