Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 105
C2 respectively, which are lines of R22, since S, T are pointsof R22. These lines meet in a point A2 of R22 (Theorem 11), whichis evidently the point in which the line PA meets the plane of R22.■ If Av Bv Cj_ are collinear, let A2 be the intersection of PA1 with the 90 THE FUNDAMENTAL THEOREM… … Fig. 40 Theoeem 13. Any line of the spatial net R3 defined by R2, R2 meetsRf and R22. (A, E)
Geometry, Projective
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