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Hilbert's eighteenth problem : ウィキペディア英語版 | Hilbert's eighteenth problem Hilbert's eighteenth problem is one of the 23 Hilbert problems set out in a celebrated list compiled in 1900 by mathematician David Hilbert. It asks three separate questions about lattices and sphere packing in Euclidean space. ==Symmetry groups in dimensions== The first part of the problem asks whether there are only finitely many essentially different space groups in -dimensional Euclidean space. This was answered affirmatively by Bieberbach.
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