Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 94
, p. 49, and the dual of Note 2, onp. 48, we may take the transversal I to be one of the sides of a com-plete quadrilateral the projection of whose vertices from a point Pforms the set of lines in question (fig. 33). Let the remaining threesides of such a quadrilateral be a, b, c. Let the points… … Fig. 33 80 THE FUNDAMENTAL THEOREM [Chap. IV be denoted by A, B, and C respectively. The sides of trie quadranglePABC meet I in the same points as the lines of the quadrangular setof lines. Coeollaey. A set of collincar points which is projective with aquadrangular set is a quadrangular set. (A, E)…
Geometry, Projective
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