On the Assouad dimension of projections

preprint2019arXivOpen access

Abstract

Let F⊂R2F \subset \mathbb{R}^{2}, and let dim⁡A\dim_{\mathrm{A}} stand for Assouad dimension. I prove that dim⁡Aπe(F)≥min⁡{dim⁡AF,1}\dim_{\mathrm{A}} π_{e}(F) \geq \min\{\dim_{\mathrm{A}} F,1\} for all e∈S1e \in S^{1} outside of a set of Hausdorff dimension zero. This is a strong variant of Marstrand's projection theorem for Assouad dimension, whose analogue is not true for other common notions of fractal dimension, such as Hausdorff or packing dimension.

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