Smart, Edward Howard · London : Macmillian and Co. · leaf 265
any tangentmeets them at K and L. If any point X be taken on QR, XK and XLare conjugate lines (Russell). CHAPTER XVI. SELF-CORRESPONDING ELEMENTS. §1. nomographic Ranges on a Conic. Two ranges of corresponding points A, B, C, ..., A, B, C, ...on a conic are said to be homographic when they… … Take then any six points A, B, C, A, B, C on a conic(Fig. 120), and let the first three correspond respectively tothe second three. 238 PROJECTIVE GEOMETRY It is required to find points D and D on the conic so thatA, B, C, D, A, B, C, D subtend pencils of equal cross-ratio atany point of the conic.…
Geometry, Projective
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