SEMINAR: Groups and Combinatorics Seminar, Multiply tiling Euclidean space by translating a convex object


Groups and Combinatorics Seminar, Multiply tiling Euclidean space by translating a convex object 
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Abstract:
We study the problem of covering Euclidean space R^d by possibly overlapping translates of a convex body P, such that almost every point is covered exactly k times, for a fixed integer k. Such a covering of Euclidean space by translations is called a ktiling. We will first give a historical survey that includes the investigations of classical tilings by translations (which we call 1tilings in this context). They began with the work of the famous crystallographer Fedorov and with the work of Minkowski, who founded the Geometry of Numbers. Some 50 years later Venkov and McMullen gave a complete characterization of all convex objects that 1tile Euclidean space.
Today we know that ktilings can be tackled by methods from Fourier analysis, though some of their aspects can be studied using purely combinatorial means. For many of our results, there is both a combinatorial proof and a Harmonic analysis proof. For k larger than 1, the collection of convex objects that ktile is much wider than the collection of objects that 1tile, and there is currently no complete knowledge of the polytopes that ktile, even in 2 dimensions. We will cover both ``ancient'', as well as very recent, results concerning 1tilings and more generally ktilings. These results are joint work with Nick Gravin, Mihalis Kolountzakis, and Dmitry Shiryaev.
Speaker(s) 
Sinai Robins (Nanyang Technological University)

Location 
Weatherburn Lecture Theatre


Contact 
Irene Pivotto
<[email protected]>

Start 
Fri, 11 Oct 2013 15:00

End 
Fri, 11 Oct 2013 16:00

Submitted by 
Irene Pivotto <[email protected]>

Last Updated 
Mon, 07 Oct 2013 15:39

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