Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 34
Fig. 5 §8] ASSUMPTION OF EXTENSION 19 at= … Fig. 6 Proof. Let the plane it be determined by the point P and the line I,and let a and b be two distinct lines of it. 1. Suppose a coincides with I (fig. 6). If b contains P, any point B of b (E 0) is collinear with P andsome point of I = a, which proves thetheorem when b contains P. If b doesnot…
Geometry, Projective
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