Research Article

Complementary bounds for the numerical and spectral radii

Published in: Quaestiones Mathematicae
Volume 48 , issue 6 : Entrepreneurship and Africa’s Cultural Context , 2024 , pages: 863–877
DOI: 10.2989/16073606.2025.2458781
Author(s): Fuad Kittaneh The University of Jordan, Jordan, Hamid Reza Moradi Islamic Azad University, Iran, Mohammad Sababheh Princess Sumaya University for Technology, Jordan,
Keywords: 47A12, 47A30, 47A63, 47B47, Numerical radius, spectral radius, operator matrix,
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Abstract

Let denote the C* –algebra of all bounded linear operators on a Hilbert space . Among other results, we show that if are nonzero, then
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