Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 95
e-dimensional formis projective with a quadrangular set, it is itself a quadrangular set.(A, E) 31. Harmonic sets. Definition. A quadrangular set Q(123, 124)is called a harmonic set and is denoted by H (12, 34). The elements3, 4 are called harmonic conjugates with respect to the elements 1, 2 ;and… … Fig. 34 Fig. 35 quadrangle, while the points B and D are the intersections of theremaining two opposite sides of the quadrangle with the line AC(fig. 34). Likewise, in a harmonic set of lines H (ac, bd), the lines aand c are two diagonal lines of a complete quadrilateral, while the §31] HARMONIC…
Geometry, Projective
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