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arXiv math/0402196math.AG
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复曲面奇点的运动生成级数

Motivic generating series for toric surface singularities

Johannes Nicaise

摘要:

Lejeune-Jalabert和Reguera计算了复曲面奇点的几何庞加莱级数P_{geom}(T)。他们提出的问题是否这个系列等于算术庞加莱系列。我们证明了这一平等的一类复曲面簇,包括表面,并构造一个反例在一般情况下。我们还计算了复曲面奇点的motivic Igusa Poincare级数Q_{geom}(T),使用motivic积分的变量变换公式,从而回答了Lejeune-Jalabert和Reguera的第二个问题。级数Q_{geom}(T)比等比级数包含更多的信息,因为它决定了奇点的多重性。在某种意义上,这是Q_{geom}(T)和P_{geom}(T)之间的唯一区别。

英文摘要:

Lejeune-Jalabert and Reguera computed the geometric Poincare series P_{geom}(T) for toric surface singularities. They raise the question whether this series equals the arithmetic Poincare series. We prove this equality for a class of toric varieties including the surfaces, and construct a counterexample in the general case. We also compute the motivic Igusa Poincare series Q_{geom}(T) for toric surface singularities, using the change of variables formula for motivic integrals, thus answering a second question of Lejeune-Jalabert and Reguera's. The series Q_{geom}(T) contains more information than the geometric series, since it determines the multiplicity of the singularity. In some sense, this is the only difference between Q_{geom}(T) and P_{geom}(T).

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