Lower and upper bounds of joint $(f,\delta)$-numerical radius functions
Functional Analysis
2026-03-20 v1
Abstract
In this study, the classical results on the joint numerical radius for -tuples of Hilbert space operators are extended to the setting of the joint -numerical radius. New and diverse contributions to this area are provided, including novel estimates for the lower and upper bounds of the -numerical radius in the context of sectorial operators.
Cite
@article{arxiv.2603.18405,
title = {Lower and upper bounds of joint $(f,\delta)$-numerical radius functions},
author = {Zameddin I. Ismailov and Sergei Silvestrov and Pembe Ipek Al},
journal= {arXiv preprint arXiv:2603.18405},
year = {2026}
}