TITLE:
Numerical Radius Inequalities for Sums and Products of Operators
AUTHORS:
Wasim Audeh
KEYWORDS:
Numeriacl Radius, Operator Norm, Operator Matrix, Inequality, Equality, Offdiagonal Part
JOURNAL NAME:
Advances in Linear Algebra & Matrix Theory,
Vol.9 No.3,
July
10,
2019
ABSTRACT: A numerical radius inequality due to Shebrawi and Albadawi says that: If Ai, Bi, Xi are bounded operators in Hilbert space, i = 1,2,..., n , and f,g be nonnegative continuous functions on [0, ∞) satisfying the relation f(t)g(t) = t (t∈[0, ∞)), then for all r≥1. We give sharper numerical radius inequality which states that: If Ai, Bi, Xi are bounded operators in Hilbert space, i = 1,2,..., n , and f,g be nonnegative continuous functions on [0, ∞) satisfying the relation f(t)g(t) = t (t∈[0, ∞)), then where . Moreover, we give many numerical radius inequalities which are sharper than related inequalities proved recently, and several applications are given.