Analytic geometry for colleges, universities, and technical schools (1892)
Nichols, E. W. (Edward West), 1858- · Boston [Mass.] : Leach, Shewell & Sanborn · leaf 285
e direction of positive abscissas, but having nopoints in the opposite direction from the origin. The surface is called the elliptical paraboloid. It may begenerated by the motion of an ellipse of variable dimensionswhose centre remains constantly on the same straight line,and whose plane continues… … Fig. D. Case 2. If we suppose G to be positive in the first memberso that the equation will take the form B7/2 4- C^- = - Gx, SURFACES OF THE SECOND ORDER. 271 the sections perpendicular to the X-axis will become imaginarywhen X > 0, and real when a; < 0. In other respects the results are…
Geometry, Analytic
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