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A Freĭman-type theorem for locally compact abelian groups

Tom Sanders — 2009

Annales de l’institut Fourier

Suppose that G is a locally compact abelian group with a Haar measure μ . The δ -ball B δ of a continuous translation invariant pseudo-metric is called d -dimensional if μ ( B 2 δ ) 2 d μ ( B δ ) for all δ ( 0 , δ ] . We show that if A is a compact symmetric neighborhood of the identity with μ ( n A ) n d μ ( A ) for all n d log d , then A is contained in an O ( d log 3 d ) -dimensional ball, B , of positive radius in some continuous translation invariant pseudo-metric and μ ( B ) exp ( O ( d log d ) ) μ ( A ) .

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