Geodesic
On symmetric subalgebras in Banach algebra
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2009), pp. 58-60

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Symmetric subalgebras of a complex Banach algebra are studied with the help of von Neiman–Fuglede Theorem. The result is closely related to the problems of approximation theory.
Keywords: symmetric Banach algebra. 
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M. I. Karakhanyan; T. M. Khudoyan. On symmetric subalgebras in Banach algebra. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2009), pp. 58-60. http://geodesic.mathdoc.fr/item/UZERU_2009_3_a9/