Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 139
ethod was fully developed by Ponceletand Gergonne in the early part of the last century in connection with the principleof duality. 124 CONIC SECTIONS [Chap. V Theoeem 18. On any line not a tangent to a given conic the pairsof conjugate points are pairs of an involution. If the line meets theconic… … Fig. 60 Definition. The pairing of the points and lines of a plane broughtabout by associating with every point its polar and with every line itspole with respect to a given conic in the plane is called a polar system. EXERCISES 1. If in a polar system two points are conjugate to a third point A,…
Geometry, Projective
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