The similarity-degree conjecture for Fourier algebras

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Let GG be a locally compact group. Write A~(G)1\widetilde{\mathrm{A}}(G)_1 for the unit ball of the unitization of the Fourier algebra A(G)\mathrm{A}(G), let C0(G)\mathcal{C}_0(G) denote the algebra of continuous functions vanishing at infinity, and let dcb(A(G))d_{\mathrm{cb}}(\mathrm{A}(G)) be the completely bounded similarity degree of A(G)\mathrm{A}(G). Similarity-degree conjecture. For every locally compact group, one has

A~(G)1≅C0(G)anddcb(A(G))≤2.\widetilde{\mathrm{A}}(G)_1\cong\mathcal{C}_0(G)\quad\text{and}\quad d_{\mathrm{cb}}(\mathrm{A}(G))\leq 2.

The claim gives a uniform upper bound on the completely bounded similarity degree of Fourier algebras and identifies the relevant unitized object with C0(G)\mathcal{C}_0(G). The supplied text does not indicate whether this assertion is established or remains open.

References

Primary source

Hun Hee Lee, Ebrahim Samei and Nico Spronk, “Similarity degree of Fourier algebras”, arXiv:1511.03423 (2016).

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