Poincaré series of resolutions of surface singularities
Poincaré series of resolutions of surface singularities
复制标题
表面奇点的庞加莱系列分辨率
DOI:
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发表时间:
2003
期刊:
影响因子:
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通讯作者:
Ana J. Reguera
中科院分区:
文献类型:
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作者:
S. Cutkosky;J. Herzog;Ana J. Reguera
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.