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arXiv 0705.1867math.AG
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关于极变换的次数--用对数叶栅的方法

On the degree of Polar Transformations -- An approach through Logarithmic Foliations

Thiago Fassarella, Jorge Vitório Pereira

摘要:

研究了一类多值齐次函数的极变换的次数。特别地,我们证明了一般线性空间的原像通过与齐次多项式$F$相关联的极变换的次数由$F$的零轨迹确定。对于零维-维线性空间这是猜想多尔加乔夫和证明迪姆卡-帕帕迪马使用拓扑参数。我们的方法是代数几何的,并依赖于自然相关的对数叶理的高斯映射的研究。

英文摘要:

We investigate the degree of the polar transformations associated to a certain class of multi-valued homogeneous functions. In particular we prove that the degree of the pre-image of generic linear spaces by a polar transformation associated to a homogeneous polynomial $F$ is determined by the zero locus of $F$. For zero dimensional-dimensional linear spaces this was conjecture by Dolgachev and proved by Dimca-Papadima using topological arguments. Our methods are algebro-geometric and rely on the study of the Gauss map of naturally associated logarithmic foliations.

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