Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 106
e argument is now reduced to the case considered in the lemma. Theorem 14. The points of a spatial net lying on a line of thespatial net form a linear net. (A, E) Proof. Let I be the given line, R2 and R22 the planar nets definingthe spatial net R3, and Lx and L2 the points in which (Theorem 13)I…
Geometry, Projective
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