Sets in $\mathbb {R}^d$ with slow-decaying density that avoid an unbounded collection of distances
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- by Alex Rice PDF
- Proc. Amer. Math. Soc. 148 (2020), 523-526 Request permission
Abstract:
For any $d\in \mathbb {N}$ and any function $f:(0,\infty )\to [0,1]$ with $f(R)\to 0$ as $R\to \infty$, we construct a set $A \subseteq \mathbb {R}^d$ and a sequence $R_n \to \infty$ such that $\|x-y\| \neq R_n$ for all $x,y\in A$ and $\mu (A\cap B_{R_n})\geq f(R_n)\mu (B_{R_n})$ for all $n\in \mathbb {N}$, where $B_R$ is the ball of radius $R$ centered at the origin and $\mu$ is a Lebesgue measure. This construction exhibits a form of sharpness for a result established independently by Furstenberg–Katznelson–Weiss, Bourgain, and Falconer–Marstrand, and it generalizes to any metric induced by a norm on $\mathbb {R}^d$.References
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Additional Information
- Alex Rice
- Affiliation: Department of Mathematics, Millsaps College, Jackson, Mississippi 39210
- MR Author ID: 1003799
- Email: riceaj@millsaps.edu
- Received by editor(s): June 5, 2019
- Published electronically: October 18, 2019
- Communicated by: Alexander Iosevich
- © Copyright 2019 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 148 (2020), 523-526
- MSC (2010): Primary 11B05, 28A75
- DOI: https://doi.org/10.1090/proc/14802
- MathSciNet review: 4052191