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Spectral enclosures for a class of block operator matrices

The spectral enclosure for σ(S) \ R given in (1.6) (in shaded orange) and the set σB(A) (in blue) on the real line. (For interpretation of the colours in the figure(s), the reader is referred to the web version of this article.)

DOI: https://doi.org/10.1016/j.jfa.2019.108455

Journal: Journal of Functional Analysis ( volume 278. issue 10, June 2020).

Link al paper