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arXiv 1409.7883math.AG
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关于多项式自同构的不动点集

On the set of fixed points of a polynomial automorphism

Zbigniew Jelonek, Tomasz Lenarcik

摘要:

设K是特征为零的代数闭域。我们说多项式自同构f:K^n -> K^n是特殊的,如果f的雅可比矩阵等于1。本文证明了非平凡特殊多项式自同构f:K^n -> K^n的不动点集合Fix(f)的每个n - 1维分支H都是单圆的.此外,我们证明了如果f是非特殊的,H是集合Fix(f)的(n-1)维分支,则H是光滑的,不可约的,H = Fix(f),且对K = C,H的欧拉示性数等于1.

英文摘要:

Let K be an algebraically closed field of characteristic zero. We say that a polynomial automorphism f : K^n -> K^n is special if the Jacobian of f is equal to 1. We show that every (n - 1)-dimensional component H of the set Fix(f) of fixed points of a non-trivial special polynomial automorphism f : K^n -> K^n is uniruled. Moreover, we show that if f is non-special and H is an (n-1)-dimensional component of the set Fix(f), then H is smooth, irreducible and H = Fix(f) and for K = C the Euler characteristic of H is equal to 1.

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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