Generalized Hausdorff measure for generic compact sets

Details Generalized Hausdorff measure for generic compact sets Generalized Hausdorff measure for generic compact sets

2012-04-05

arxiv.org/abs/1204.1100v1

Mathematics

Classical Analysis and ODEs

8 pages

Scientific paper

Let $X$ be a Polish space. We prove that the generic compact set $K\subseteq X$ (in the sense of Baire category) is either finite or there is a continuous gauge function $h$ such that $0<\mathcal{H}^{h}(K)<\infty$, where $\mathcal{H}^h$ denotes the $h$-Hausdorff measure. This answers a question of C. Cabrelli, U. B. Darji, and U. M. Molter. Moreover, for every weak contraction $f\colon K\to X$ we have $\mathcal{H}^{h} (K\cap f(K))=0$. This is a measure theoretic analogue of a result of M. Elekes.

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