An Approximation Lemma about the Cut Locus , with Applications in Optimal Transport Theory

@inproceedings{Figalli2008AnAL,
  title={An Approximation Lemma about the Cut Locus , with Applications in Optimal Transport Theory},
  author={Alessio Figalli and C{\'e}dric Villani},
  year={2008}
}
A path in a Riemannian manifold can be approximated by a path meeting only finitely many times the cut locus of a given point. The proof of this property uses recent works of Itoh–Tanaka and Li–Nirenberg about the differential structure of the cut locus. We present applications in the regularity theory of optimal transport. 
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