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Banach algebra elements whose spectra intersect R+
Published online by Cambridge University Press: 20 January 2009
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Let A denote a complex Banach algebra with unit, Inv(A) the set of invertible elements of A, Sp(a) and r(a) the spectrum and spectral radius respectively of an element a of A. Let Γ denote the set of elements of A whose spectra contain non-negative real numbers, i.e.
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- Copyright © Edinburgh Mathematical Society 1974
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