Applied Mathematics

Volume 4, Issue 11 (November 2013)

ISSN Print: 2152-7385   ISSN Online: 2152-7393

Google-based Impact Factor: 0.58  Citations  

Spectra of 2 × 2 Upper-Triangular Operator Matrices

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DOI: 10.4236/am.2013.411A1004    3,419 Downloads   5,498 Views  Citations
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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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H. Zhang, "Spectra of 2 × 2 Upper-Triangular Operator Matrices," Applied Mathematics, Vol. 4 No. 11A, 2013, pp. 22-25. doi: 10.4236/am.2013.411A1004.

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