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On $ R $-subcommuting maps and best approximations in Banach spacesDOI: 10.5556/j.tkjm.32.2001.51-53 Abstract: A result on best approximation is proved in Banach spaces satisfying Opial's condition. Recent results of Jungck and Sessa [Math. Japonica, 42(1995), 249-252.] are extended to a new class of noncommuting maps.
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