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- W4296538088 abstract "In the Engel group with its Carnot group structure we study subsets of locally finite subRiemannian perimeter and possessing constant subRiemannian normal. We prove the rectifiability of such sets: more precisely we show that, in some specific coordinates, they are upper-graphs of entire Lipschitz functions (with respect to the Euclidean distance). However we find that, when they are written as intrinsic upper-graphs with respect to the direction of the normal, then the function defining the set might even fail to be continuous. Nevertheless, we can prove that one can always find other horizontal directions for which the set is the upper-graph of a function that is Lipschitz-continuous with respect to the intrinsic distance (and in particular Holder-continuous for the Euclidean distance). We further discuss a PDE characterization of the class of all sets with constant horizontal normal. Finally, we show that our rectifiability argument extends to the case of filiform groups of the first kind." @default.
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- W4296538088 date "2012-01-30" @default.
- W4296538088 modified "2023-09-23" @default.
- W4296538088 title "Regularity of sets with constant horizontal normal in the Engel group" @default.
- W4296538088 doi "https://doi.org/10.48550/arxiv.1201.6399" @default.
- W4296538088 hasPublicationYear "2012" @default.
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