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Generalized module extension Banach algebras: derivations and weak amenability. (English) Zbl 1429.46033
Summary: Let $$A$$ and $$X$$ be Banach algebras and let $$X$$ be an algebraic Banach $$A$$-module. Then the $$\ell^1$$-direct sum $$A\times X$$ equipped with the multiplication $(a,x)(b,y) = (ab,ay+xb+xy)\quad (a,b\in A,\,x,y\in X)$ is a Banach algebra, denoted by $$A \bowtie X$$, which will be called “a generalized module extension Banach algebra”. Module extension algebras, Lau product and also the direct sum of Banach algebras are the main examples satisfying this framework. We characterize the structure of $$n$$-dual valued $$(n \in \mathbb{N})$$ derivations on $$A \bowtie X$$ from which we investigate the $$n$$-weak amenability for the algebra $$A \bowtie X$$. We apply the results and the techniques of proofs for presenting some older results with simple direct proofs.

##### MSC:
 46H25 Normed modules and Banach modules, topological modules (if not placed in 13-XX or 16-XX) 46H20 Structure, classification of topological algebras
##### Keywords:
Banach algebra; derivation; $$n$$-weak amenability
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##### References:
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