2023
DOI: 10.48550/arxiv.2301.04645
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Vertical projections in the Heisenberg group for sets of dimension greater than 3

Abstract: It is shown that vertical projections of Borel sets in the Heisenberg group of dimension strictly greater than 3 almost surely have positive area. The proof uses the point-plate incidence method introduced by Fässler and Orponen, and also uses a similar approach to a recent maximal inequality of Zahl for fractal families of tubes. It relies on the endpoint case of the trilinear Kakeya inequality in R 3 .

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