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Questions about Hausdorff measures, their variants (such as spherical Hausdorff measures) and generalisations.
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Subsets $X$ such that their Hausdorff outer measure is not finite
Let $H^d:\mathcal{P}(\mathbf{R}^n) \to \mathbf{R}\cup \{\infty\}$ be the $d$-dimensional Hausdorff outer measure on $\mathbf{R}^n$, for some $0<d<n$ with $n$ integer, which is constructed in the follo …