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arXiv 1901.04145math.AGmath.GR
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高维Cremona群的商

Quotients of higher dimensional Cremona groups

Jérémy Blanc, Stéphane Lamy, Susanna Zimmermann

摘要:

本文研究了定义在C或C的一个子域上的双有理变换Bir(X)的大群,其中X是维数至少为3的簇.两个突出的情况是当X是射影空间时,在这种情况下Bir(X)是秩为n的Cremona群,或者当X是光滑的三次超曲面时。在这两种情况下,更一般地说,当X是一个圆锥丛的双有理群时,我们产生了从Bir(X)到Z/2的无穷多个不同的群同态,特别表明群Bir(X)不是完美的,因此不是简单的。作为一个结果,我们还得到,Cremona群的秩n至少3是不是由线性和Jonquières元素生成。

英文摘要:

We study large groups of birational transformations Bir(X), where X is a variety of dimension at least 3, defined over C or a subfield of C. Two prominent cases are when X is the projective space, in which case Bir(X) is the Cremona group of rank n, or when X is a smooth cubic hypersurface. In both cases, and more generally when X is birational to a conic bundle, we produce infinitely many distinct group homomorphisms from Bir(X) to Z/2, showing in particular that the group Bir(X) is not perfect and thus not simple. As a consequence we also obtain that the Cremona group of rank n at least 3 is not generated by linear and Jonquières elements.

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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