Some comparative results on eigenvalues, pseudospectra and conditionspectra
Let \(A\) be an \(n\times n\) matrix with complex entries and fix the parameters \(0<\varepsilon <1\) and \(\mu >0\). One can define the spectrum of \(A\), the \(\mu\)-pseudospectrum of \(A\) and the \(\varepsilon\)-condition spectrum. In this paper, the author compares ten results on these three concepts. It is an interesting paper, despite some unconventional choices for the notation.
scientific article; zbMATH DE number 7383695