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arXiv 1001.2632math.AC
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半对偶模的重数

Multiplicities of semidualizing modules

Susan M. Cooper, Sean Sather-Wagstaff

摘要:

交换诺特环R上的模C是半对偶的,如果Hom_R(C,C)\cong R且Ext^i_R(C,C)= 0,对所有i \geq 1.对于某些局部Cohen-Macaulay环(R,m),证明了对于所有半对偶R-模C和所有m-准素理想J,Hilbert-Samuel重数eR(J;C)= eR(J;R)是相等的.我们所研究的环类包括由定义射影空间中胖点方案的理想或单项式理想所决定的环类.

英文摘要:

A finitely generated module C over a commutative noetherian ring R is semidualizing if Hom_R(C,C) \cong R and Ext^i_R(C,C) = 0 for all i \geq 1. For certain local Cohen-Macaulay rings (R,m), we verify the equality of Hilbert-Samuel multiplicities e_R(J;C) = e_R(J;R) for all semidualizing R-modules C and all m-primary ideals J. The classes of rings we investigate include those that are determined by ideals defining fat point schemes in projective space or by monomial ideals.

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