Isodiametric inequality in Carnot groups

Details Isodiametric inequality in Carnot groups Isodiametric inequality in Carnot groups

2010-04-08

arxiv.org/abs/1004.1369v1

Mathematics

Metric Geometry

14 pages

Scientific paper

The classical isodiametric inequality in the Euclidean space says that balls maximize the volume among all sets with a given diameter. We consider in this paper the case of Carnot groups. We prove that for any Carnot group equipped with a Haar measure one can find a homogeneous distance for which this fails to hold. We also consider Carnot-Caratheodory distances and prove that this also fails for these distances as soon as there are length minimizing curves that stop to be minimizing in finite time. Next we study some connections with the comparison between Hausdorff and spherical Hausdorff measures, rectifiability and the generalized 1/2-Besicovitch conjecture giving in particular some cases where this conjecture fails.

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