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Hausdorff dimension of unions of $k$-planes

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arxiv 2305.14544 v2 pith:U6SWSHLL submitted 2023-05-23 math.CA

classification math.CA
keywords betamathcaldimensionplanestextunionsbigcupbrascamp-lieb
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abstract

We prove a conjecture of H\'era on the dimension of unions of $k$-planes. Let $0<k \le d<n$ be integers, and $\beta\in[0,k+1)$. If $\mathcal{V}\subset A(k,n)$, with $\text{dim}(\mathcal{V})=(k+1)(d-k)+\beta$, then $\text{dim}(\bigcup_{V\in\mathcal{V}}V)\ge d+\min\{1,\beta\}$. The proof combines a recent idea of Zahl and the Brascamp-Lieb inequality.

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  1. On the packing dimension of unions and extensions of $k$-planes

    math.CA 2025-08 conditional novelty 7.0 of 10

    For unions of subsets of k-planes, the paper proves packing dimension bounds analogous to known Hausdorff dimension results, and for hyperplanes proves an exact preservation of packing dimension under full-dimension e...

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