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In abstract algebra, a Koszul algebra is a graded -algebra over which the ground field has a linear minimal graded free resolution, ''i.e.'', there exists an exact sequence: : It is named after the French mathematician Jean-Louis Koszul. We can choose bases for the free modules in the resolution; then the maps can be written as matrices. For a Koszul algebra, the entries in the matrices are zero or linear forms. An example of a Koszul algebra is a polynomial ring over a field, for which the Koszul complex is the minimal graded free resolution of the ground field. There are Koszul algebras whose ground fields have infinite minimal graded free resolutions, ''e.g'', == See also == *Koszul duality 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「Koszul algebra」の詳細全文を読む スポンサード リンク
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