Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 263
axis. As z^ increases numerically from 0 to ± c^ the sectiondiminishes in size, until when 2;j = ^ it slirinks to a nullellipse, the single point (0, 0, c). As z^ increases nu-merically beyond ± c^ the section becomes imaginary;hence the surface does not extend beyond the planesz = c and z = — c.… … Fig. 14. axes respectively, and diminishing in size as the cuttingplane moves off from the origin to the points where thesurface cuts the axes.
Geometry, Analytic
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