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arXiv 1108.2676math.AG
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关于射影超曲面的极度

On the polar degree of projective hypersurfaces

Thiago Fassarella, Nivaldo Medeiros

摘要:

给定复射影$n$ -空间中的一个超曲面,我们用纯代数几何方法证明了它的极映射的次数的几个已知公式。进一步,我们给出了它的极图的度的公式,它的极图的度是由它的分支的极图的度来表示的。作为应用,我们用低次极图对平面曲线进行了分类,并给出了I. Dolgachev的等距平面曲线分类。

英文摘要:

Given a hypersurface in the complex projective $n$-space we prove several known formulas for the degree of its polar map by purely algebro-geometric methods. Furthermore, we give formulas for the degree of its polar map in terms of the degrees of the polar maps of its components. As an application, we classify the plane curves with polar map of low degree, including a very simple proof of I. Dolgachev's classification of homaloidal plane curves.

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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