A Sard theorem for the distance function
- Cite this article as:
- Itoh, J. & Tanaka, M. Math Ann (2001) 320: 1. doi:10.1007/PL00004462
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In this article, we prove that the set of all critical values of the distance function from a submanifold of a complete Riemannian manifold whose dimension is less than 5 is of Lebesgue measure zero.