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Hyper-Tauberian algebras and weak amenability of Figà-Talamanca-Herz algebras
Authors:Ebrahim Samei
Institution:Department of Mathematics, University of Manitoba, Winnipeg, Man., Canada R3T 2N2
Abstract:We study certain commutative regular semisimple Banach algebras which we call hyper-Tauberian algebras. We first show that they form a subclass of weakly amenable Tauberian algebras. Then we investigate the basic and hereditary properties of them. Moreover, we show that if A is a hyper-Tauberian algebra, then the linear space of bounded derivations from A into any Banach A-bimodule is reflexive. We apply these results to the Figà-Talamanca-Herz algebra Ap(G) of a locally compact group G for p∈(1,∞). We show that Ap(G) is hyper-Tauberian if the principal component of G is abelian. Finally, by considering the quantization of these results, we show that for any locally compact group G, Ap(G), equipped with an appropriate operator space structure, is a quantized hyper-Tauberian algebra. This, in particular, implies that Ap(G) is operator weakly amenable.
Keywords:Tauberian algebra  Local operators  Approximately local derivations  Locally compact groups  Fourier algebra  Figà  -Talamanca-Herz algebra  Operator spaces  Weak amenability
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