Σεμιναριο Αναλυσης
http://www.math.uoc.gr/analysis-seminar
Analysis Seminars in the World / Analysis seminars in Greece
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.
Seminar organizer for 2024-25: Silouanos Brazitikos
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