A short proof that B(L_1) is not amenable

Choi, Yemon (2020) A short proof that B(L_1) is not amenable. Proceedings of the Royal Society of Edinburgh: Section A Mathematics. ISSN 0308-2105 (In Press)

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Abstract

Non-amenability of ${\mathcal B}(E)$ has been surprisingly difficult to prove for the classical Banach spaces, but is now known for $E= \ell_p$ and $E=L_p$ for all $1\leq p<\infty$. However, the arguments are rather indirect: the proof for $L_1$ goes via non-amenability of $\ell^\infty({\mathcal K}(\ell_1))$ and a transference principle developed by Daws and Runde (Studia Math., 2010). In this note, we provide a short proof that ${\mathcal B}(L_1)$ and some of its subalgebras are non-amenable, which completely bypasses all of this machinery. Our approach is based on classical properties of the ideal of representable operators on $L_1$, and shows that ${\mathcal B}(L_1)$ is not even approximately amenable.

Item Type:
Journal Article
Journal or Publication Title:
Proceedings of the Royal Society of Edinburgh: Section A Mathematics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2600
Subjects:
ID Code:
148163
Deposited By:
Deposited On:
13 Oct 2020 09:55
Refereed?:
Yes
Published?:
In Press
Last Modified:
14 Oct 2020 22:10