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Analysis Seminar in Crete (2026-27)
 

Σεμιναριο Αναλυσης

http://www.math.uoc.gr/analysis-seminar


    Department of Mathematics and Applied Math / Previous years: 2025-26/ 2024-25/ 2023-24/ 2022-23/ 2021-22/ 2020-21/ 2019-20/ 2018-19/ 2017-18/ 2016-17/ 2015-16/ 2014-15/ 2013-14/ 2012-13/ 2011-12/ 2010-11/ 2009-10/ 2008-09/ 2007-08/ 2006-07/ 2005-06/ 2004-05 / Summer 2004 / 2003-04 / 2002-03 / 2001-02 / 2000-01 / 1999-00

    Analysis Seminars in the World / Analysis seminars in Greece

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Thu, 17 Sep 2026, 11:15, Room: A303
Speaker: Kailing Lai (Guangzhou Univ. and Univ. Crete)

Common tiling functions with small support

 

Abstract: For $N$ lattices in $\RR^d$ with volume $1$ and pairwise trivial intersections, every nonzero common tiling function has support diameter $\Omega(N^{1/d})$, while for lattice families whose fundamental domains have uniformly bounded diameters, the standard convolution construction gives an $O(N)$ upper bound, leaving a gap that has remained open since the work of Kolountzakis and Wolff. We close this gap by constructing, for every $d\geq 2$ and all $N\ge 2$, lattice families satisfying the same volume and intersection conditions that admit a nonnegative common tiling function with support diameter $O(N^{1/d})$, thereby also answering a question posed by Kolountzakis and Papageorgiou. We also obtain the optimal $O(\sqrt N)$ upper bound by constructing, for any prescribed family of plane lattices whose volumes lie in a fixed bounded set independent of $N$, a pairwise trivially intersecting family with the same respective volumes and with bases arbitrarily close to suitable bases of the prescribed lattices.

 


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Seminar organizer for 2024-25: Silouanos Brazitikos

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