Geodesic
Some remarks on properties of elements from complex Banach algebras
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2013), pp. 15-21

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In this work some properties related to von Neumann effect of commutators of elements from complex Banach algebras are discussed, as well as their "convexity”.
Keywords: Banach algebra, "convexity” element, commutator. 
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M. I. Karakhanyan; H. A. Kamalyan. Some remarks on properties of elements from complex Banach algebras. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2013), pp. 15-21. http://geodesic.mathdoc.fr/item/UZERU_2013_2_a2/