Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 57
PiPjPk may* Girard Desargues, 1593-1662. 42 PROJECTION, SECTION, PERSPECTIVITY [Chap, n be denoted by lijk (i,j, Jc = 1, 2, 3, 4, 5). This notation makes it pos-sible to tell at a glance which lines and points are united. Clearly apoint is on a line of the configuration if and only if the suffixes… … EXERCISES 1. Prove Theorem 1/ without making use of the principle of duality. 2. If two complete n-points in different planes are perspective from a point,the pairs of homologous sides intersect in collinear points. What is the dualtheorem ? What is the corresponding theorem concerning any two…
Geometry, Projective
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