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Abstract
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We provide a large class of discrete amenable groups for which the complex group
ring has several C*-completions, thus providing partial evidence towards a positive
answer to a question raised by Rostislav Grigorchuk, Magdalena Musat and Mikael
Rørdam.
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Keywords
group rings, C*-norms, the Atiyah conjecture
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Mathematical Subject Classification 2010
Primary: 16S34, 46L05, 46L10
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Milestones
Received: 17 August 2018
Accepted: 27 August 2018
Published: 8 March 2019
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