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arXiv math/0406240math.AG
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多指标滤子与motivic Poincare级数

Multi-index filtrations and motivic Poincare series

Antonio Campillo, Felix Delgado, Sabir M. Gusein-Zade

摘要:

函数芽环上的多指标滤子的Poincare级数可表示为关于该环的射影化上的欧拉示性数的某个积分。在这里,这个积分被认为是相对于广义欧拉示性数的Grothendieck环的品种值。对于由平面曲线奇点$C$的分量上的函数的阶定义的滤子,以及对于由一系列爆破修正$(\C^2,0)$的所谓除法滤子,分别给出了该积分的关于芽$C$的嵌入分解或关于修正的公式。计算了对应于除滤子的扩张半群的广义欧拉示性数。

英文摘要:

The Poincare series of a multi-index filtration on the ring of germs of functions can be written as a certain integral with respect to the Euler characteristic over the projectivization of the ring. Here this integral is considered with respect to the generalized Euler characteristic with values in the Grothendieck ring of varieties. For the filtration defined by orders of functions on the components of a plane curve singularity $C$ and for the so called divisorial filtration for a modification of $(\C^2,0)$ by a sequence of blowing-ups there are given formulae for this integral in terms of an embedded resolution of the germ $C$ or in terms of the modification respectively. The generalized Euler characteristic of the extended semigroup corresponding to the divisorial filtration is computed.

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