Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 113
ace. In general, it is clearthat any complete five-point in any properly or improperly projectivespace determines a subspace which is rational and therefore properlyprojective. 36. The configuration of Pappus. Mutually inscribed and circum-scribed triangles. Theorem 21. If A, B, C are any three… … Proof. Let the three points of intersection referred to in the theorembe denoted by C, A, B respectively (fig. 44). Let the line BCmeet the line BC in a point D (to be proved identical with A);also let BC meet V in Av the line AB meet AC in Bv the line ABmeet AC in B[. We then have the following…
Geometry, Projective
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