S-spectra and S-essential pseudospectra of the diagonal block operator matrices
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DOI: 10.15672/hujms.701108
Abstract: In this article, the relationships between the $S$-spectra, the $ S$-spectral radius, the $ \epsilon$-$S$-essential pseudospectra, and the $ \epsilon$-$S$-essential pseudospectral radius of the diagonal block operator matrices in the direct sum of Banach spaces… read more here.
Keywords: operator matrices; diagonal block; essential pseudospectra; block operator ... See more keywords
Approximation of the block numerical range of block operator matrices
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DOI: 10.2298/fil1912877y
Abstract: In this paper we obtain an approximation of the block numerical range of bounded and unbounded block operator matrices by projection methods. read more here.
Keywords: block numerical; block; operator matrices; block operator ... See more keywords