Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 252
e see that the section will be real only when c and zhave the same sign. Hence the surface lies above or below theXl-plane according as c is positive or negative. The form ofthe surface is shown in Fig. 135,where c is supposed to be posi-tive. 179. The hyperbolic parabo-loid. If the coefficients… … >JC Fig. 135 intersecting at the origin, and the sections parallel to the XY-plaue form a system of concentric hyperbolas which recede fromthe trace on the XF-plane as z increases or diminishes. Thetransverse axis of one of these hyperbolas is parallel to the X-axisif c and z have the same sign,…
Geometry, Analytic
Internet Archive · Boston College Libraries · Public Domain Mark 1.0. Free to use for anything.
