On the elliptical range theorems for the Davis-Wielandt shell, the numerical range, and the conformal range
Spectral Theory
2026-03-10 v2
Abstract
We consider the elliptical range theorems for the Davis--Wielandt shell, the numerical range, and the conformal range in terms of and related to their quadratic representations. The emphasis is on exposing a variety of elementary approaches.
Keywords
Cite
@article{arxiv.2211.13145,
title = {On the elliptical range theorems for the Davis-Wielandt shell, the numerical range, and the conformal range},
author = {Gyula Lakos},
journal= {arXiv preprint arXiv:2211.13145},
year = {2026}
}