Thread: parabolic or planar points
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Old November 5th, 2008, 02:58 PM
dori1123 dori1123 is offline
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Default parabolic or planar points
Show that if a surface is tangent to a plane along a curve, then the points of this curve are either parabolic or planar.

Defition: A point of a surface is parabolic if det(dN_p) = 0 with dN_p =/= 0. A point of a surface is planar if dN_p = 0.
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