Geodesic
Stability of isometries between groups of invertible elements in Banach algebras
Funkcionalʹnyj analiz i ego priloženiâ, Tome 49 (2015) no. 2, pp. 34-38.

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In this paper we prove the Hyers–Ulam stability of surjective isometries between groups of invertible elements of a unital Banach algebra and $C(K)$, where $K$ is a compact metric space.
Keywords: $\varepsilon$-isometry, Hyers–Ulam problem, Banach algebras. 
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Yunbai Dong; Rui Shi. Stability of isometries between groups of invertible elements in Banach algebras. Funkcionalʹnyj analiz i ego priloženiâ, Tome 49 (2015) no. 2, pp. 34-38. http://geodesic.mathdoc.fr/item/FAA_2015_49_2_a3/

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