Explicit Bounds for the Pseudospectra of Various Classes of Matrices and Operators

We study the \(\epsilon\)-pseudospectra \(\sigma_\epsilon(A)\) of square matrices \(A \in \mathbb{C}^{N \times N}\). We give a complete characterization of the \(\epsilon\)-pseudospectrum of any \(2 \times 2\) matrix and describe the asymptotic behavior (as \(\epsilon \to 0\)) of \(\sigma_\epsilon(A...

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Hauptverfasser: Gong, Feixue, Meyerson, Olivia, Meza, Jeremy, Stoiciu, Mihai, Ward, Abigail
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description We study the \(\epsilon\)-pseudospectra \(\sigma_\epsilon(A)\) of square matrices \(A \in \mathbb{C}^{N \times N}\). We give a complete characterization of the \(\epsilon\)-pseudospectrum of any \(2 \times 2\) matrix and describe the asymptotic behavior (as \(\epsilon \to 0\)) of \(\sigma_\epsilon(A)\) for any square matrix \(A\). We also present explicit upper and lower bounds for the \(\epsilon\)-pseudospectra of bidiagonal matrices, as well as for finite rank operators.
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subjects Asymptotic properties
Lower bounds
Mathematics - Numerical Analysis
Mathematics - Spectral Theory
Operators (mathematics)
title Explicit Bounds for the Pseudospectra of Various Classes of Matrices and Operators
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