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Nonamenability and Borel paradoxical decompositions for locally compact groups
We show that a locally compact group <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper G"> <mml:semantics> <mml:mi>G</mml:mi> <mml:annotation encoding="application/x-tex">G</mml:annotation> </mml:semantics> </mml:math> </inline-formula> is not amenable if and only if it admits a Borel paradoxical decomposition.