Geodesic
Isometries and Isomorphisms in quasi-Banach algebras
Acta mathematica Universitatis Comenianae, Tome 80 (2011) no. 2 
Zhihua Wang; Wanxiong Zhang. Isometries and Isomorphisms in quasi-Banach algebras. Acta mathematica Universitatis Comenianae, Tome 80 (2011) no. 2. http://geodesic.mathdoc.fr/item/AMUC_2011_80_2_a12/
@article{AMUC_2011_80_2_a12,
     author = {Zhihua Wang and Wanxiong Zhang},
     title = {Isometries and {Isomorphisms} in {quasi-Banach} algebras},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2011},
     volume = {80},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2011_80_2_a12/}
}
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Voir la notice de l'article provenant de la source Comenius University

In this paper, we prove the Hyers-Ulam-Rassias stability of isometries and of homomorphisms for additive functional equations in quasi-Banach algebras. This is applied to investigate isomorphisms between quasi-Banach algebras.