Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 304
our distinct points (proper or improper). Any two conies of thepencil determined by these points have the same self-polar triangle.Dually, two such conies have four common tangents, and any two § ioi] PAIRS OF CONICS 289 conies of the range determined by these common tangents have the… … Fig. 101 Type II. When thecommon self-polar figureis of Type II, one of thepoints lies on its polar,and therefore this polar isa tangent to each of theconies A2, B2. Since twotangents cannot intersectin a point of contact, thetwo lines of the self-polarfigure are not both tan-gents. Hence the point…
Geometry, Projective
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
