Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 35
Fig. 8 A = B, the theorem is proved. … 20 THEOREMS OF ALIGNMENT AND DUALITY [Chap, i Theorem 6. The plane a determined by a line I and a point P isidentical with the plane ft determined by a line m and a point Q,provided m and Q are on a. (A, E 0) Proof. Any point B of /3 is collinear with Q and a point A of m(fig. 9). A and Q are both…
Geometry, Projective
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