A Note on the Buchsbaum-Rim function of a parameter module

In this article, we prove that the Buchsbaum-Rim function $\ell_A(§_{ν+1}(F)/N^{ν+1})$ of a parameter module $N$ in $F$ is bounded above by $e(F/N) \binom{ν+d+r-1}{d+r-1}$ for every integer $ν\geq 0$. Moreover, it turns out that the base ring $A$ is Cohen-Macaulay once the equality holds for some integer $ν$. As a direct consequence, we observe that the first Buchsbaum-Rim coefficient $e_1(F/N)$ of a parameter module $N$ is always non-positive.

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