A Note on Nagata’s Automorphism

A Note on Nagata’s Automorphism
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关于永田自同构的注解

DOI:
10.1007/978-94-015-8555-2_15
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发表时间:
1995
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通讯作者:
J. Alev
J. Alev
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作者:
J. Alev

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本文的目的是证明Nagata在[6]中定义的仿射3-空间的某种自同构不是tarne。使用的Bruhat分解的雅可比矩阵的转换和双类的产品规则的水平,我们表明,某些类型的因子分解是不可能的这种自同构。我要感谢F。大仲马和P.波罗进行了一些有益的讨论。
The purpose of this note is to bring evidence to the fact that a certain automorphism of affine 3-space defined by N agata in [6] is not tarne. U sing the Bruhat decomposition at the level of the jacobian of the transformations involved and the product rules of double classes, we show that certain types of factorizations are impossible for this automorphism. I would like to thank F. Dumas and P. Polo for some useful discussions.