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New Generalized Numerical Radius Inequalities for Hilbert Space Operators

Authors
Vuk StojiljkovicEnergma research partner

Faculty of Science, University of Novi Sad, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia

Fuad KittanehMath PhD

University of Jordan, Queen Rania Street (University Street) Al-Jubeiha, Amman, Jordan

Published: February 27th 2026

We announce that our research partner continues his contribution to advanced operator theory with a newly published study introducing a powerful and flexible framework for numerical radius inequalities.

This work defines generalized real and imaginary parts of an operator through functions selected from a specified class. Building on this structure, the team introduces a new generalized numerical radius that, under appropriate conditions, forms a norm on the underlying operator space.

The paper rigorously develops the fundamental properties of this generalized numerical radius. It establishes new inequalities governing the ratio between the generalized radius and the operator norm. It also presents refined bounds and a new identity for the generalized numerical radius.

In addition, the final section introduces operator matrix inequalities that extend standard numerical radius inequalities. A key strength of the new generalized numerical radius lies in its adaptability. Constructed through flexible functional parameters, it provides a unifying framework capable of accommodating evolving operator structures, including applications to dynamical systems where operator characteristics change over time.

This research reinforces our commitment to advancing mathematical theory through precise generalization, rigorous inequality development, and structural unification of existing results. Read the full paper here.

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