Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 106
Fig. 42 Fig. 43 SL1 and SL2 meet R2 and R22 in linear nets (Theorem 12); and, byTheorem 13, a line joining any point P of R3 on I to Ax meets eachof these linear nets. Hence all points of R3 on I are in the planarnet determined by these two linear nets. Moreover, by the definitionof R3, all the…
Geometry, Projective
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