Objectif
Following the work of Freiman, Ruzsa, Green, and Fields medal winner Bourgain, Gowers, Tao, the sumset problem is investigated. We consider two topics where the geometry of the ambient group has an important role. Firstly we plan to improve the known inequalities for the sum of subsets in the Euclidean spaces using more tools from convex geometry. For abelian groups, various structure theorem is available about sets whose sum with itself is relatively small. In the non-abelian case, only conjectures are circulating. Secondly we plan to test these conjectures for word hyperbolic groups. Here we plan to combine technics related to Szemeredi's Regularity Lemma with the geometric properties of the Cayley graph.
Champ scientifique
Mots‑clés
Thème(s)
Appel à propositions
FP7-PEOPLE-IEF-2008
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Régime de financement
MC-IEF - Intra-European Fellowships (IEF)Coordinateur
08034 Barcelona
Espagne