Poincaré series of resolutions of surface singularities

Poincaré series of resolutions of surface singularities
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表面奇点的庞加莱系列分辨率

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发表时间:
2003
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通讯作者:
Ana J. Reguera
Ana J. Reguera
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文献类型:
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作者:
S. Cutkosky;J. Herzog;Ana J. Reguera

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设X → spec(R)是法向曲面奇点spec(R)的奇点分解,其中整数例外因子为E1,.,埃尔河考虑Poincare级数g = h(n)tn,其中h(n)=(R/Γ(X,Ox(-n1 E - 1 -. - n r E r))。证明了若R/m有特征零点且Pic 0(X)是半交换簇,则Poincare级数g是有理的.然而,我们给出的例子表明,这个系列可以是无理的,如果这些条件之一失败。
Let X → spec(R) be a resolution of singularities of a normal surface singularity spec(R), with integral exceptional divisors E 1 ,..., E r . We consider the Poincare series g = h(n)t n , where h(n) = (R/Γ(X, O x (-n 1 E - 1 - ... - n r E r )). We show that if R/m has characteristic zero and Pic 0 (X) is a semi-abelian variety, then the Poincare series g is rational. However, we give examples to show that this series can be irrational if either of these conditions fails.