Question

Differential Geometry

Prove that for a coordinate patch x(u,v), where U is the unit normal defined as L, V 1,0) (0,1 1,0) , and K is the Gaussian Curvature.

U_u \times U_v = K(x_u\times x_v)

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Answer #1

A coordinate patch on manifold M is an open subset U \subseteq M together with a map \phi :U \rightarrow R^{n} that is homeomorphism between U and its message o(U) . With this a manifold is a topological space where every point can be contained in some coordinate patch.

Here a coordinate patch is x(u,v). Given U is unit normal given by

r(10 (u, u)* 0, (u, v) = Uu x Uv

and K is Gaussian Curvature, where K=K1K2

Therefore Uu x Uv = K( xu * xv )

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