Upper Triangular Operator Matrices, SVEP and Browder, Weyl Theorems
نویسندگان
چکیده
منابع مشابه
Upper Triangular Operator Matrices , SVEP and Browder , Weyl Theorems
A Banach space operator T ∈ B(X ) is polaroid if points λ ∈ isoσσ(T ) are poles of the resolvent of T . Let σa(T ), σw(T ), σaw(T ), σSF+(T ) and σSF−(T ) denote, respectively, the approximate point, the Weyl, the Weyl essential approximate, the upper semi–Fredholm and lower semi–Fredholm spectrum of T . For A, B and C ∈ B(X ), let MC denote the operator matrix (
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ژورنال
عنوان ژورنال: Integral Equations and Operator Theory
سال: 2008
ISSN: 0378-620X,1420-8989
DOI: 10.1007/s00020-008-1648-8