$S$-spectra and $S$-essential pseudospectra of the diagonal block operator matrices
نویسندگان
چکیده
In this article, the relationships between $S$-spectra, $ S$-spectral radius, \epsilon$-$S$-essential pseudospectra, and pseudospectral radius of diagonal block operator matrices in direct sum Banach spaces their coordinate operators are studied. Then, results supported by applications.
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ژورنال
عنوان ژورنال: Hacettepe journal of mathematics and statistics
سال: 2021
ISSN: ['1303-5010']
DOI: https://doi.org/10.15672/hujms.701108