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A surface is a two-dimensional topological manifold. The term can also be used to describe a smooth surface, depending on the context.

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Can we always find coordinates on a surface such that $K=K(u-v)$?

Let $(M^2,g)$ be a 2-dimensional Riemannian manifold. For any point $p\in M^2$ can we always find coordinates $(u,v)$ in a neighborhood $U$ of $p$ such that the Gaussian curvature is only a function o …
Daniel Castro's user avatar