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LetAbeafinitedimensionalassociatealgebrawithidentityoverafieldkandmodAbethecategoryoffinitedimensionalA_modules.LetAe =A k Aop betheenvelopingalgebraofA ,denotebyAithei_foldtensorproductoverkofAwithitself,andby (a1 ,a2 ,… ,ai)theelementa1 a2 … aiinAi,thentheHochschildcomplex (A + 1 ,b)ofAisdefinedviab :An+ 1 →An withb(a1 ,a2 ,… ,an) =∑ni=1( - 1 ) i-1 (a1 ,… ,aiai+ 1 ,… ,an+ 1 ) + ( - 1 ) n(an+ 1 a1 ,… ,an)andH (A) =H(A + 1 ,b)iscalled ththeHochschildhomologygroupofA .Then… 相似文献
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