Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 247
r of the involutionin question as the intersection of the tangent at oo with the line joiningthe points x, y. The point x + y is then determined as the intersectionwith the conic of the line joining the center to the point 0. Similarly, 232 ONE-DIMENSIONAL PROJECTIVITIES [Chap, viii to obtain the…
Geometry, Projective
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