Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 65
n may bemade to the effect that the lines joining the vertices of a quadrilateral to a point Pform a quadrangular set of lines, etc. (cf. § 30, Chap. IV). 50 PROJECTION, SECTION, PEESPECTIVITY [Chap, ii quadrangles are said to be similarly placed (fig. 20); if a point tripleof one corresponds to a… … Fig. 21 With the notation for quadrangular sets defined above, the lasttheorem leads to the following Corollary. If all but one of the points of a quadrangular set Q (ABC,DJEF) are given, the remaining one is uniquely determined. (A, E) For two quadrangles giving rise to the same quadrangular…
Geometry, Projective
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