A generalization of a result of Cohen-Hewitt is given in the case of Jordan-Banach algebras. Some precisions of factorization are obtained.
@article{urn:eudml:doc:40062, title = {Th\'eor\`emes de factorisation dans les alg\`ebres completes de Jordan.}, journal = {Collectanea Mathematica}, volume = {46}, year = {1995}, pages = {239-254}, zbl = {0861.46030}, mrnumber = {MR1380365}, language = {fr}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:40062} }
Akkar, M.; Laayouni, M. Théorèmes de factorisation dans les algèbres completes de Jordan.. Collectanea Mathematica, Tome 46 (1995) pp. 239-254. http://gdmltest.u-ga.fr/item/urn:eudml:doc:40062/