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arXiv 1704.07643math.AC
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Rees滤子定理、重数函数和归约准则

Rees' theorem for filtrations, multiplicity function and reduction criteria

Parangama Sarkar

摘要:

设$J\subset I$是形式等维局部环中的理想,其中$λ(I/J)<\infty.$ Rees证明了对所有的$n\gg0$,$λ(I^n/J^n)$是$n$中次数至多为dim $R$的多项式$P(I/J)(X)$,$J$是$I$的约化当且仅当deg $P(I/J)(X)\leq$ dim $R-1.$。(不一定是诺特式的)解析不可约环中理想的过滤。我们提供了某些类的理想,使度$P(I/J)$达到其最大程度。另一方面,对于形式等维局部环中的理想$J\subset I$,我们考虑了重数函数$e(I^n/J^n)$,它是$n$中的多项式,对于所有的大$n.$,我们明确地确定了在某些特殊情况下的度$e(I^n/J^n)$。对于解析偏差为1的理想$J$,在某些附加条件下,给出了用度$e(I^n/J^n)$表示的约化特征.

英文摘要:

Let $J\subset I$ be ideals in a formally equidimensional local ring with $λ(I/J)<\infty.$ Rees proved that for all $n\gg0$, $λ(I^n/J^n)$ is a polynomial $P(I/J)(X)$ in $n$ of degree at most dim $R$ and $J$ is a reduction of $I$ if and only if deg $P(I/J)(X)\leq$ dim $R-1.$ We extend this result for all Noetherian filtrations of ideals in a formally equidimensional local ring and for (not necessarily Noetherian) filtrations of ideals in analytically irreducible rings. We provide certain classes of ideals such that deg $P(I/J)$ achieves its maximal degree. On the other hand, for ideals $J\subset I$ in a formally equidimensional local ring, we consider the multiplicity function $e(I^n/J^n)$ which is a polynomial in $n$ for all large $n.$ We explicitly determine the deg $e(I^n/J^n)$ in some special cases. For an ideal $J$ of analytic deviation one, we give characterization of reductions in terms of deg $e(I^n/J^n)$ under some additional conditions.

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