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arXiv · 1607.01758

A Localized Besicovitch-Federer Projection Theorem

Harrison Pugh
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Abstract

The classical Besicovitch-Federer projection theorem implies that the d-dimensional Hausdorff measure of a set in Euclidean space with non-negligible d-unrectifiable part will strictly decrease under orthogonal projection onto almost every d-dimensional linear subspace. In fact, there exist maps which are arbitrarily close to the identity in the C^0 topology which have the same property. A converse holds as well, yielding the following rectifiability criterion: under mild assumptions, a set is rectifiable if and only if its Hausdorff measure is lower semi-continuous under bounded Lipschitz perturbations.

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Harrison Pugh. 2016-07-06. A Localized Besicovitch-Federer Projection Theorem. https://arxiv.org/abs/1607.01758

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