Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 63
hich is evi-dently I, since it contains two points of 1. But P.]* and E,P± are 48 PBOJECTION, SECTION, PEPSPECTIVITY [Chap, n two homologous sides of these last two triangles. Hence they inter-sect in a point of the line I. If a vertex or side of one quadrangle coincides with a vertex orside of the… … Pig. 19 of intersection of homologous sides of the two given quadrangles. Bythe argument above, its sixth side will meet the sixth side respectivelyof each of the two given quadrangles in the same point of I. Thiscompletes the proof of the theorem. Note 1. It should be noted that the theorem is…
Geometry, Projective
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