Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 33
proved on the assumption (explicitlystated in each case) that the necessary points and lines exist. Theassumptions of extension, E, insuring the existence of all the pointswhich we consider, will be given presently. The first of these, how-ever, it is desirable to introduce at this point.An… … Fig. 5 §8] ASSUMPTION OF EXTENSION 19 at=
Geometry, Projective
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