Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 257
whose coordinate has the unique sign inthe equation. When a = b, the equation becomes —+^5—- = 1, a1 a1 (r which is the equation of an unparted hyperboloid of revo- 238 ANALYTIC GEOMETRY OF SPACE [Ch. V, § 30 lution about the Z-axis. The equations — — + ^_ + * x2 * b2 b2 and — — &- + — = 1…
Geometry, Analytic
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