Geodesic
Logarithms of moduli of inversible elements of a~Banach algebra
Matematičeskie zametki, Tome 23 (1978) no. 3, pp. 373-377.

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The isomorphism of a separable Banach algebra of continuous functions with $C(X)$ is deduced from the properties of the set of logarithms of moduli of invertible elements of the algebra. 
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     author = {B. T. Batikyan},
     title = {Logarithms of moduli of inversible elements of {a~Banach} algebra},
     journal = {Matemati\v{c}eskie zametki},
     pages = {373--377},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_23_3_a4/}
}
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B. T. Batikyan. Logarithms of moduli of inversible elements of a~Banach algebra. Matematičeskie zametki, Tome 23 (1978) no. 3, pp. 373-377. http://geodesic.mathdoc.fr/item/MZM_1978_23_3_a4/