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arXiv · 2305.01779

The Uniqueness of the Gauss Image Measure

Vadim Semenov
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Abstract

We show that if the Gauss Image Measure of submeasure $\lambda$ via convex body $K$ agrees with the Gauss Image Measure of $\lambda$ via convex body $L$, then the radial Gauss Image maps of their duals, are equal to each other almost everywhere as multivalued maps with respect to $\lambda$. As an application of this result, we establish that, in this case, dual bodies, $K^*$ and $L^*$, are equal up to a dilation on each rectifiable path connected component of the support of $\lambda$. Additionally, we provide many previously unknown properties of the radial Gauss Image map, most notably its variational Lipschitz behavior, establish some measure theory concepts for multivalued maps and, as a supplement, show how the main uniqueness statement neatly follows from the Hopf Theorem under additional smooth assumptions on $K$ and $L$.

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Vadim Semenov. 2023-05-02. The Uniqueness of the Gauss Image Measure. https://arxiv.org/abs/2305.01779

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