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arXiv 0810.1614math.AG
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正交群的交换化与模簇的基本群

Abelianisation of orthogonal groups and the fundamental group of modular varieties

V. Gritsenko, K. Hulek, G. K. Sankaran

摘要:

研究了不定二次型的整正交群的换位子群。我们表明,该交换子的指数是2的许多群体中发生的模空间在代数几何,特别是模的K3表面的建设。给出了模形式和计算某些模空间的基本群的应用。

英文摘要:

We study the commutator subgroup of integral orthogonal groups belonging to indefinite quadratic forms. We show that the index of this commutator is 2 for many groups that occur in the construction of moduli spaces in algebraic geometry, in particular the moduli of K3 surfaces. We give applications to modular forms and to computing the fundamental groups of some moduli spaces.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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