411 REFERENCE · Wiktionary
Hadwiger-Kneser-Poulsen conjecture
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Proper noun
1
en geometry A conjecture (proven in the plane but not yet in higher dimensions) stating that, if the centers of a system of balls in Euclidean space are moved closer together, then the volume of the union of the balls cannot increase.
Category:English eponyms