Spectra of 2 × 2 Upper-Triangular Operator Matrices ()
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ABSTRACT
In [Perturbation of Spectrums of 2 × 2 Operator Matrices, Proceedings of the American Mathematical Society, Vol. 121, 1994], the authors asked whether there was an operator such that for a given pair (A,B) of operators, where the operator was defined by . In this note, a partial answer for the question is given.
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