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In algebra, the Gelfand–Kirillov dimension (or GK dimension) of a right module ''M'' over a ''k''-algebra ''A'' is: : where the sup is taken over all finite-dimensional subspaces and . An algebra is said to have polynomial growth if its Gelfand–Kirillov dimension is finite. == Basic facts == *The Gelfand–Kirillov dimension of a finitely generated commutative algebra ''A'' over a field is the Krull dimension of ''A'' (or equivalently the transcendence degree of the field of fractions of ''A'' over the base field.) *In particular, the GK dimension of the polynomial ring Is ''n''. *(Warfield) For any real number ''r ''≥ 2, there exists a finitely generated algebra whose GK dimension is ''r''. 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「Gelfand–Kirillov dimension」の詳細全文を読む スポンサード リンク
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