We study Weyl's and Browder's theorem for an operator T on a Banach space such that T or its adjoint has the single-valued extension property. We establish the spectral mapping theorem for the Weyl spectrum, and we show that Browder's theorem holds for f (T) for every f is an element of H(sigma(T)). Also, we give necessary and sufficient conditions for such T to obey Weyl's theorem. Weyl's theorem in an important class of Banach space operators is also studied.
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Pontificia Univ Catolica Rio de Janeiro, BR-22453900 Rio De Janeiro, BrazilPontificia Univ Catolica Rio de Janeiro, BR-22453900 Rio De Janeiro, Brazil
Duggal, BP
Kubrusly, C
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Pontificia Univ Catolica Rio de Janeiro, BR-22453900 Rio De Janeiro, BrazilPontificia Univ Catolica Rio de Janeiro, BR-22453900 Rio De Janeiro, Brazil