| Abstract: | We prove that if C is a convex N-dimensional body whose boundary is twice continuously differentiable and uniformly convex, then the Cheeger set of C is unique. The Cheeger set of C is the set which minimizes, inside C, the ratio perimeter over volume.
This is a revised version (of July 2006) of a paper submitted in April 2006, to appear in Pacific Journal of Mathematics (231 n°2, 2007)
A recent proof of uniqueness of the Cheeger set without any regularity assumption on the boundary of the convex body has been found by Alter and Caselles (see http://www.iua.upf.es/~vcaselles/, the preprint though seems yet unavailable)
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