Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 247
respect to the XZ- and IZ-planes and with respect to theZ-axis, but it is not symmetrical with respect to the Xl^planenor with respect to the X- and Y-axes. If one or more of the coefficients in either (1) or (2) are zero,the surface is called a degenerate quadric. 230 EQUATIONS AND THEIR LOCI… … Fig. 132 The intercepts on the X-, Y-, Z-axes are respectively ± a, ± b,± c. The numbers a, b, c are the lengths of the semiaxes. The traces on the coordinate planes are all ellipses, representedin the figure by ABCD, BEDF, and AECF. The equations ofthese traces are respectively t + t = i^ -^^^ =…
Geometry, Analytic
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