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math.NA2026
Update to: Spectral sets: Numerical range and beyond
Michel Crouzeix, Anne Greenbaum
We use the results of Lorist and Schwenninger, {\em A solution to Crouzeix's conjecture}, arXiv:2608.03841v2, https://arxiv.org/abs/2608.03841, to update the 2019 paper of Crouzeix…
math.NA2023
Numerical bounds on the Crouzeix ratio for a class of matrices
Crouzeix Michel, Greenbaum Anne, Li Kenan
We provide numerical bounds on the Crouzeix ratiofor KLS matrices which have a line segment on the boundary of the numerical range. The Crouzeix ratio is the supremum over all…