A note on block diagonal and block triangular preconditioners for complex symmetric linear systems
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DOI: 10.1007/s11075-018-0520-4
Abstract: In this note, the additive block diagonal preconditioner (Bai et al., Numer. Algorithms 62, 655–675 2013) and the block triangular preconditioner (Pearson and Wathen, Numer. Linear Algebra Appl. 19, 816–829 2012) are further studied and… read more here.
Keywords: note block; block; triangular preconditioners; block diagonal ... See more keywords
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