A general geometry and calculus : including book I. of the general geometry, treating of loci in a plane; and an elementary course in the differential and integral calculus (1881)
Olney, Edward, 1827-1887 · New York : Sheldon and Co. · leaf 68
nsverse axis, and e the eccentricity, or the char-acteristic ratio {4:2). Dem.—Let the curve in Fig. 39 be conceivedto change position so as to assume that in Fig.40 or 41, the axis of the curve coinciding withthe axis of abscissas, the origin at the centre,A, F the focus and CB the directrix.… … Y^ Fig. 41.
Geometry, Analytic · Calculus
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