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arXiv 2102.08165math.AC
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任意滤子的重数与混合重数

Multiplicities and Mixed Multiplicities of arbitrary Filtrations

Steven Dale Cutkosky, Parangama Sarkar

摘要:

我们开发了一个理论的多重性和混合多重性的过滤,延长理论的过滤$m$ -准素理想任意(不一定Noether)过滤。解析非分歧局部环$R$上$r$滤子的混合重数来自于次数等于环维数的$r$变量中一个合适的齐次多项式的系数,类似于局部环中$m$ -准素理想的混合重数的经典情形.证明了Minkowski不等式对任意滤子成立。平等的特征Minkowski不等式的m-准素理想在局部环Teissier,里斯和夏普和卡茨不延伸到任意filtrations,但我们表明,他们是真正的一个大的和重要的子范畴的filtrations。我们定义了可除的和有界的过滤。一个固定理想的幂的滤子是有界滤子,就像一个整除滤子一样。我们证明了在一个优良的局部区域上,Minkowski等式中等式的刻画是由合适的Rees类代数的整闭包相同的条件刻画的,严格推广了Teissier,Rees,Sharp和Katz的定理.我们还证明了Rees的一个定理,其特征在于包含具有相同重数的理想推广到优秀的局部域中的有界过滤。我们给出了一些其他的应用,扩展经典定理的理想。

英文摘要:

We develop a theory of multiplicities and mixed multiplicities of filtrations, extending the theory for filtrations of $m$-primary ideals to arbitrary (not necessarily Noetherian) filtrations. The mixed multiplicities of $r$ filtrations on an analytically unramified local ring $R$ come from the coefficients of a suitable homogeneous polynomial in $r$ variables of degree equal to the dimension of the ring, analogously to the classical case of the mixed multiplicities of $m$-primary ideals in a local ring. We prove that the Minkowski inequalities hold for arbitrary filtrations. The characterization of equality in the Minkowski inequality for m-primary ideals in a local ring by Teissier, Rees and Sharp and Katz does not extend to arbitrary filtrations, but we show that they are true in a large and important subcategory of filtrations. We define divisorial and bounded filtrations. The filtration of powers of a fixed ideal is a bounded filtration, as is a divisorial filtration. We show that in an excellent local domain, the characterization of equality in the Minkowski equality is characterized by the condition that the integral closures of suitable Rees like algebras are the same, strictly generalizing the theorem of Teissier, Rees and Sharp and Katz. We also prove that a theorem of Rees characterizing the inclusion of ideals with the same multiplicity generalizes to bounded filtrations in excellent local domains. We give a number of other applications, extending classical theorems for ideals.

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