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In mathematics, the Koszul cohomology groups ''K''''p'',''q''(''X'', ''L'') are groups associated to a projective variety ''X'' with a line bundle ''L''. They were introduced by , and named after Jean-Louis Koszul as they are closely related to the Koszul complex. surveys early work on Koszul cohomology, gives an introduction to Koszul cohomology, and gives a more advanced survey. ==Definitions== If ''M'' is a graded module over the symmetric algebra of a vector space ''V'', then the Koszul cohomology ''K''''p'',''q''(''M'',''V'') of ''M'' is given by the cohomology of the sequence : If ''L'' is a line bundle over a projective variety ''X'', then the Koszul cohomology ''K''''p'',''q''(''X'',''L'') is given by the Koszul cohomology ''K''''p'',''q''(''M'',''V'') of the graded module ''M'' = ⊕''q''''H''0(''L''''q''), as a module over the symmetric algebra of the vector space ''V''=''H''0(''L''). 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 cohomology」の詳細全文を読む スポンサード リンク
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