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[几何] 椭圆反演变成椭圆

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hbghlyj posted 2019-8-3 07:56 |Read mode
Last edited by hbghlyj 2023-5-13 14:40椭圆$Γ'$是椭圆$Γ$的反演像,求证:$Γ$和$Γ'$离心率相同

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original poster hbghlyj posted 2023-5-12 16:44
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血狼王 发表于 2016-2-10 04:44
(1)椭圆以其中心为反演点做反演变换,那么其反演形是否可以仍为椭圆?
(2)椭圆以其焦点为反演点做反演 ...

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1+1=? posted 2023-5-13 19:53 from mobile
若两个离心率相同的椭圆作彼此的椭圆反演,得到的像仍为离心率相同的椭圆,这里的椭圆反演是类比圆反演定义的。

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谢谢! 我已经更正  posted 2023-5-13 21:42

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1+1=? posted 2023-5-13 20:00 from mobile
这样定义的椭圆反演有几何义,一个点反演后变为该点极线的中点

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$f$是反演,$g$是圆到椭圆的仿射,则$gfg^{-1}$是椭圆反演  posted 2023-5-14 00:34

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