Hyper-Tauberian algebras and weak amenability of Figà–Talamanca–Herz algebras

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. © 2005 Elsevier Inc. All rights reserved.