Equations for Whitney's Umbrella

The equations for Whitney's Umbrella are

f(u, v) = ( u*v, u, v^2 ),

-1 <= u <= 1, -1 <= v <= 1 

source: Alfred Gray, Modern Differential Geometry of Curves and Surfaces.

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Created: Jul 20 1995 ---- Last modified: Wed Aug 16 22:47:01 1995
Copyright © 1995 by The Geometry Center, all rights reserved