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arXiv math/0209018math.AGmath.CO
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稳定自旋曲线的组合性质

Combinatorial properties of stable spin curves

Lucia Caporaso, Cinzia Casagrande

摘要:

研究了稳定自旋曲线的模空间的几何性质,着重讨论了它的组合性质。在这种情况下,标准的图论框架不仅仅是一个簿记设备:一些纯粹的组合结果证明,具有模理论的应用。特别是,稳定曲线的模空间的某些层的特征在于一组(有限的)整数,衡量自旋曲线方案的非约化性,并且可以用纯粹的图论术语定义。

英文摘要:

The geometry of the moduli space of stable spin curves is studied, with emphasis on its combinatorial properties. In this context, the standard graph theoretic framework is not just a book-keeping device: some purely combinatorial results are proved, having moduli theoretic applications. In particular, certain strata of the moduli space of stable curves are characterized by a (finite) set of integers, measuring the non-reducedness of the scheme of spin curves, and definable in purely graph-theoretical terms.

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