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- W1640897514 abstract "Let $M_C= [begin {smallmatrix} A& C 0 & B end {smallmatrix}]$ be a $2times 2$ upper triangular operator matrix acting on the Banach space $Eoplus F$. We investigate the set of the operators $C$ for which $sigma (M_C)=sigma (A)cup sigma (B)$, where $sigma (.)$ denotes the spectrum." @default.
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- W1640897514 date "2003-01-28" @default.
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- W1640897514 title "A note on the spectrum of an upper triangular operator matrix" @default.
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- W1640897514 doi "https://doi.org/10.1090/s0002-9939-03-06862-x" @default.
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