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 June 13th, 2013, 06:32 AM #1 Member   Joined: Dec 2006 Posts: 90 Thanks: 0 Ruled Surfaces What's relevance among the coefficients of the first and second fundamental forms of a ruled surface?
 July 19th, 2013, 05:27 PM #2 Member   Joined: May 2013 From: Phnom Penh, Cambodia Posts: 77 Thanks: 0 Re: Ruled Surfaces You can find the relevance among those coefficients by using Gaussian Curvature of non-cylindrical ruled surface K = (LN -M^2)/(EG-F^2) Where vect n means vector of n. E, F, G are the coefficients of the first fundamental form of surface, L, M, N are the coefficients of the second fundamental form of surface.

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