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arXiv math/0509567math.AG
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曲线的模空间是刚性的

The moduli space of curves is rigid

Paul Hacking

摘要:

我们证明了亏格g的稳定曲线的模栈是刚性的,即,没有无穷小的变形。这证实了Kapranov提出的原理的第一种情况。它也可以被看作是映射类群的Mostow刚性的一个版本。

英文摘要:

We prove that the moduli stack of stable curves of genus g with n marked points is rigid, i.e., has no infinitesimal deformations. This confirms the first case of a principle proposed by Kapranov. It can also be viewed as a version of Mostow rigidity for the mapping class group.

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