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Piecewise linear approximation of smooth functions of two variables

Joseph H.G. Fu — 2013

Actes des rencontres du CIRM

The normal cycle of a singular subset X of a smooth manifold is a basic tool for understanding and computing the curvature of X . If X is replaced by a singular function on n then there is a natural companion notion called the of f , which has been introduced by the author and by R. Jerrard. We discuss a few fundamental facts and open problems about functions f that admit gradient cycles, with particular attention to the first nontrivial dimension n = 2 .

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