Limits of special Weierstrass points

Limits of special Weierstrass points
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特殊Weierstrass点的限制

DOI:
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发表时间:
2007
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通讯作者:
Letterio Gatto
Letterio Gatto
中科院分区:
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文献类型:
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作者:
Caterina Cumino;E. Esteves;Letterio Gatto

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设C为在点P处横相交的两条一般连通的光滑的无理线X和Y的并集,设P是X或Y的一般点,我们的主要结果描述了沿退化为C的光滑曲线的特殊Weierstrass点在C上的所有极限。作为一个应用,我们以一种统一的和概念上更简单的方式恢复了Diaz和Cukierman对稳定曲线模空间中具有特殊Weierstrass点的曲线的除数类的计算。在我们的方法中,没有多重性问题,这是测试曲线方法通常令人讨厌的问题
Let C be the union of two general connected, smooth, nonrational curves X and Y inter- secting transversally at a point P. Assume that P is a general point of X or of Y. Our main result describes all limits on C of special Weierstrass points along smooth curves degenerating to C . As an application, we recover in a unified and conceptually simpler way the computations made by Diaz and Cukierman of divisor classes of curves with special Weierstrass points in the moduli space of stable curves. In our approach there are no multiplicity issues, an usual nuisance of the method of test curves