Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 98
st theorem as follows:The sides of a complete quadranglewhich meet in a diagonal point areharmonic with the other tivo diago-nal points. In like manner, we maysay that two points are harmonicwith two planes, if the line joiningthe points meets the planes in apair of points harmonic with thegiven… … Fig. 36 EXERCISES 1. Prove Theorem 4 directly from a figure without using Theorem 2,Chap. III. 2. Prove Theorem 5, Cor. 2, directly from a figure. 3. Through a given point in a plane construct a line which passes throughthe point of intersection of two given lines in the plane, without making useof…
Geometry, Projective
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