2004/11/12 | Humbert定理[Humbert's Theorem]
类别(∑〖数学〗) | 评论(0) | 阅读(25) | 发表于 13:40
The necessary and sufficient condition that an algebraic curve has an algebraic involute is that the arc length is a two-valued algebraic function of the coordinates of the extremities. Furthermore, this function is a root of a quadratic equation whose coefficients are rational functions of x and y.
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