Geodesic
Group Algebra Modules. II
Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 151-173

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The present paper began as a natural outgrowth of our first paper, where we characterized the module homomorphisms from group algebras into a fairly restrictive class of group algebra modules. We now investigate module homomorphisms from group algebras into a more general class of group algebra modules. Although the two papers are thus related, they can be read quite independently.Section 2 contains our extension, Theorem 2.1, of P. J. Cohen's theorem on factorization in Banach algebras (1). Our extension is to Banach modules over Banach algebras equipped with an approximate identity. We should mention first that J.-K. Wang observed the existence of such a generalization, and secondly, that our proof requires no ideas different from those in Cohen's proof. Nevertheless, we include a proof that condenses the original proof considerably. 
Gulick, S. L.; Liu, T. S.; Rooij, A. C. M. Van. Group Algebra Modules. II. Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 151-173. doi: 10.4153/CJM-1967-009-0
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