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On the numerical radius of an element of a normed algebra
Published online by Cambridge University Press: 18 May 2009
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Let A be a unital normed algebra over the complex field ℂ, A' the dual space of A, i.e., the Banach space of all continuous linear functionals on A, and let S be the set of all states on A, i.e.,
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- Copyright © Glasgow Mathematical Journal Trust 1974
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