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Research Article | Open Access

An estimate for the numerical radius of the Hilbert space operators and a numerical radius inequality

Mohammad H. M. Rashid1( )Feras Bani-Ahmad2
Department of Mathematics, Faculty of Science P.O.Box(7), Mu'tah university, Al-Karak, Jordan
Department of Mathematics, Faculty of Science, The Hashemite University P.O.Box 330127, Zarqa 13133, Jordan
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Abstract

We provide a number of sharp inequalities involving the usual operator norms of Hilbert space operators and powers of the numerical radii. Based on the traditional convexity inequalities for nonnegative real numbers and some generalize earlier numerical radius inequalities, operator. Precisely, we prove that if A i , B i , X i B ( H ) ( i = 1 , 2 , , n), m N , p , q > 1 with 1 p + 1 q = 1 and ϕ and ψ are non-negative functions on [ 0 , ) which are continuous such that ϕ ( t ) ψ ( t ) = t for all t [ 0 , ), then

w 2 r ( i = 1 n X i A i m B i ) n 2 r 1 m j = 1 m i = 1 n 1 p S i , j p r + 1 q T i , j q r r 0 inf ξ = 1 ρ ( ξ ) ,

where r 0 = min { 1 p , 1 q }, S i , j = X i ϕ 2 ( | A i j | ) X i , T i , j = ( A i m j B i ) ψ 2 ( | A i j | ) A i m j B i and

ρ ( ξ ) = n 2 r 1 m j = 1 m i = 1 n ( S i , j r ξ , ξ p 2 T i , j r ξ , ξ q 2 ) 2 .

CLC number: 47A12, 47A30, 47B15, 47A63

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AIMS Mathematics
Pages 26384-26405

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Cite this article:
Rashid MHM, Bani-Ahmad F. An estimate for the numerical radius of the Hilbert space operators and a numerical radius inequality. AIMS Mathematics, 2023, 8(11): 26384-26405. https://doi.org/10.3934/math.20231347

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Received: 20 July 2023
Revised: 28 August 2023
Accepted: 10 September 2023
Published: 15 November 2023
©2023 the Author(s), licensee AIMS Press.

This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0)