Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 317
in the tangent plane.Hence the theorem may be expressed in the form: Theorem XIII. Every tangent plane to the hyperloloidof one nappe intersects the surface in a pair of straight linespassing through the point of tangency. It is evident from the preceding theory that the surface in questionmay be…
Geometry, Analytic
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