2 papers
math.FA2020
Crouzeix's Conjecture and related problems
Kelly Bickel, Pamela Gorkin, Anne Greenbaum +3
In this paper, we establish several results related to Crouzeix's conjecture. We show that the conjecture holds for contractions with eigenvalues that are sufficiently well-separat…
math.NA2019
First-order Perturbation Theory for Eigenvalues and Eigenvectors
Anne Greenbaum, Ren-cang Li, Michael L. Overton
We present first-order perturbation analysis of a simple eigenvalue and the corresponding right and left eigenvectors of a general square matrix, not assumed to be Hermitian or nor…