Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author · New York, The Macmillan company · leaf 261
FiO. 130 Fig. 131 axis Os are evidently ellipses in the case of the elliptic parab-oloid, and hyperbolas in the case of the hyperbolic paraboloid.The plane Oxy itself has only the origin ia common with theelliptic paraboloid; it intersects the hyperbolic paraboloid inthe two lines x^/a^ — y^/b^ =…
Geometry, Analytic
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