Abstract
A theorem of Steinhaus states that if \(E\subset \mathbb {R}^d\) has positive Lebesgue measure, then the difference set \(E-E\) contains a neighborhood of 0. Similarly, if E merely has Hausdorff dimension \(\hbox {dim}_{{\mathcal {H}}}(E)>(d+1)/2,\) a result of Mattila and Sjölin states that the distance set \(\varDelta (E)\subset \mathbb {R}\) contains an open interval. In this work, we study such results from a general viewpoint, replacing \(E-E\) or \(\varDelta (E)\) with more general \(\varPhi \)-configurations for a class of \(\varPhi :\mathbb {R}^d\times \mathbb {R}^d\rightarrow \mathbb {R}^k,\) and showing that, under suitable lower bounds on \(\hbox {dim}_{{\mathcal {H}}}(E)\) and a regularity assumption on the family of generalized Radon transforms associated with \(\varPhi ,\) it follows that the set \(\varDelta _\varPhi (E)\) of \(\varPhi \)-configurations in E has nonempty interior in \(\mathbb {R}^k\). Further extensions hold for \(\varPhi \)-configurations generated by two sets, E and F, in spaces of possibly different dimensions and with suitable lower bounds on \(\hbox {dim}_{{\mathcal {H}}}(E)+\hbox {dim}_{{\mathcal {H}}}(F).\)
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Dedicated to the memory of Eli Stein, who inspired by his scholarship, teaching and friendship.
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Greenleaf, A., Iosevich, A. & Taylor, K. Configuration Sets with Nonempty Interior. J Geom Anal 31, 6662–6680 (2021). https://doi.org/10.1007/s12220-019-00288-y
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DOI: https://doi.org/10.1007/s12220-019-00288-y