The dual Hilbert-Samuel function of a Maximal Cohen-Macaulay module

Details The dual Hilbert-Samuel function of a Maximal Cohen-Macaulay module The dual Hilbert-Samuel function of a Maximal Cohen-Macaulay module

2008-09-19

arxiv.org/abs/0809.3353v1

Mathematics

Commutative Algebra

Scientific paper

Let $R$ be a Cohen-Macaulay local ring with a canonical module $\omega_R$. Let $I$ be an $\m$-primary ideal of $R$ and $M$, a maximal Cohen-Macaulay $R$-module. We call the function $n\longmapsto \ell (\Hom_R(M,{\omega_R}/{I^{n+1} \omega_R}))$ the dual Hilbert-Samuel function of $M$ with respect to $I$. By a result of Theodorescu this function is a polynomial function. We study its first two normalized coefficients.

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