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Название: Approximate groups. The torsion-free nilpotent case.
Авторы: Breuliard E., Green B.
Abstract: We describe the structure of 'K-approximate subgroups' of torsion-free nilpotent groups, paying particular attention to Lie groups.
Three other works, by Fisher et al., by Sanders and by Tao, have appeared that independently address related issues. We comment briefly on some of the connections between these papers.
Keywords: approximate group; nilpotent progression; additive combinatorics; Freiman's theorem