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A surface is a generalization of a plane which needs not be flat, that is, the curvature is not necessarily zero. This is analogous to a curve generalizing a straight line

13 votes

A simple closed curve on a surface

There are multiple ways, depending on what your goal is. From an algorithmic point of view, if you are given a triangulation of the surface, normal curves are a very efficient way to describe a simp …
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