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In mathematics, a eutactic lattice (or eutactic form) is a lattice in Euclidean space whose minimal vectors form a eutactic star. This means they have a set of positive eutactic coefficients ''c''''i'' such that (''v'', ''v'') = Σ''c''''i''(''v'', ''m''''i'')2 where the sum is over the minimal vectors ''m''''i''. "Eutactic" means "well-situated" or "well-arranged". proved that a lattice is extreme if and only if it is both perfect and eutactic. summarize the properties of eutactic lattices of dimension up to 7. ==References== * * * * * * * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「eutactic lattice」の詳細全文を読む スポンサード リンク
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