This is a preview. Log in through your library . Abstract Ivory's theorem says: For a family of confocal conics, let P, Q, R, S be the four vertices of a curvilinear ...
https://doi.org/10.4169/college.math.j.45.5.371 https://www.jstor.org/stable/10.4169/college.math.j.45.5.371 We present a surprising property of intersecting confocal ...
A TEXT-BOOK for students who have already finished the straight line and circle: its contents are about equally divided between the conic sections and the geometry of three dimensions, finishing with ...
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