Mathematics – Operator Algebras
Scientific paper
2010-12-03
Mathematics
Operator Algebras
10 pages; some remarks are clarified (v2)
Scientific paper
We prove that weak amenability of a locally compact group imposes a strong
condition on its amenable closed normal subgroups. This extends non weak
amenability results of Haagerup (1988) and Ozawa--Popa (2010). A von Neumann
algebra analogue is also obtained.
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