Hilbert-Samuel functions of modules over Cohen-Macaulay rings

Details Hilbert-Samuel functions of modules over Cohen-Macaulay rings Hilbert-Samuel functions of modules over Cohen-Macaulay rings

2004-12-09

arxiv.org/abs/math/0412194v2

Mathematics

Commutative Algebra

revised version. To appear in Proc. Amer. Math. Soc

Scientific paper

For a finitely generated, non-free module $M$ over a CM local ring $(R,\fm,k)$, it is proved that for $n\gg 0$ the length of $\tor 1RM{R/\fm^{n+1}}$ is given by a polynomial of degree $\dim R-1$. The vanishing of $\tor iRM{N/\fm^{n+1}N}$ is studied, with a view towards answering the question: if there exists a finitely generated $R$-module $N$ with $\dim N\ge 1$ such that the projective dimension or the injective dimension of $N/\fm^{n+1}N$ is finite, then is $R$-regular? Upper bounds are provided for $n$ beyond which the question has an affirmative answer.

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