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411 REFERENCE · Wiktionary

Keller's conjecture

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English Etymology The conjecture was introduced by Ott-Heinrich Keller (1930). Proper noun en geometry The conjecture that, in any tiling of n-dimensional Euclidean space by identical hypercubes, there are two hypercubes that share an entire (n − 1)-dimensional face with each other. Related terms en Keller graph en eponyms