Deformations of Transformations of Ribaucour.
نویسنده
چکیده
and is the tangent of F at x. Dually then, r and 1/k being the absolute points, the conic F the Feuerbach circle, and the conic R a rectangular hyperbola on the four given orthocentric points, and having its centre c on F, if the common diameter of F and R meet R at points dd', then these points are double foci of circular curves of class 3 on the 6 lines; the circles with centres d and d' and touching F at c are the tritangent conics; and the two cubics touch F at c.
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عنوان ژورنال:
- Proceedings of the National Academy of Sciences of the United States of America
دوره 2 3 شماره
صفحات -
تاریخ انتشار 2005