A criterion of contractivity for four by four upper-triangular matrices
Functional Analysis
2025-06-17 v2
Abstract
We establish an explicit criterion for determining whether a upper-triangular matrix is a contraction with respect to the Euclidean operator norm.
Keywords
Cite
@article{arxiv.2506.10485,
title = {A criterion of contractivity for four by four upper-triangular matrices},
author = {Axel Renard},
journal= {arXiv preprint arXiv:2506.10485},
year = {2025}
}