A new class of $({\cal H}^k,1)$-rectifiable subsets of metric spaces

Details A new class of $({\cal H}^k,1)$-rectifiable subsets of metric spaces A new class of $({\cal H}^k,1)$-rectifiable subsets of metric spaces

2011-09-14

arxiv.org/abs/1109.3181v1

Mathematics

Metric Geometry

Scientific paper

The main motivation of this paper arises from the study of Carnot--Carath\'eodory spaces, where the class of 1-rectifiable sets does not contain smooth non-horizontal curves; therefore a new definition of rectifiable sets including non-horizontal curves is needed. This is why we introduce in any metric space a new class of curves, called continuously metric differentiable of degree $k$, which are H\"older but not Lipschitz continuous when $k>1$. Replacing Lipschitz curves by this kind of curves we define $({\cal H}^k,1)$-rectifiable sets and show a density result generalizing the corresponding one in Euclidean geometry. This theorem is a consequence of computations of Hausdorff measures along curves, for which we give an integral formula. In particular, we show that both spherical and usual Hausdorff measures along curves coincide with a class of dimensioned lengths and are related to an interpolation complexity, for which estimates have already been obtained in Carnot--Carath\'eodory spaces.

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