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arXiv 1604.08262math.AG
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关于跳弹轨迹的几何学

On the geometry of the ricochet locus

Jaydeep Chipalkatti

摘要:

本文是一个研究所谓的“跳弹配置”(或$R$ -配置),它出现在帕斯卡定理的背景下。给出了$R$ -组态中六元组的一对Pascal线重合的几何证明。我们计算了一个通用的$R$ -配置的对称群,以及所有这样的配置的子品种${\mathcal R} \subseteq {\mathbb P}^6$的程度。我们还确定了${\mathcal R}$的$SL(2)$ -等变定义方程,并证明了它是两个不变超曲面的理想-理论完全交。

英文摘要:

This paper is a study of the so-called `ricochet configuration' (or $R$-configuration) which arises in the context of Pascal's theorem. We give a geometric proof of the fact that a specific pair of Pascal lines is coincident for a sextuple in $R$-configuration. We calculate the symmetry group of a generic $R$-configuration, as well as the degree of the subvariety ${\mathcal R} \subseteq {\mathbb P}^6$ of all such configurations. We also determine the $SL(2)$-equivariant defining equations for ${\mathcal R}$, and show that it is an ideal-theoretic complete intersection of two invariant hypersurfaces.

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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