Matrices with invariant by rotation numerical ranges
Functional Analysis
2025-10-02 v2 Numerical Analysis
Numerical Analysis
Abstract
We characterize the d x d matrices whose numerical ranges are invariant by rotations of angle 2/d.
Keywords
Cite
@article{arxiv.2507.20631,
title = {Matrices with invariant by rotation numerical ranges},
author = {Michel Crouzeix},
journal= {arXiv preprint arXiv:2507.20631},
year = {2025}
}