New inequalities for numerical radius w(A) of Hilbert space operators are derived via convex functions, generalizing and improving results by El-Haddad and Kittaneh, including a bound for r≥2.
Yamazaki, On upper and lower bounds of the numerical radius and an equal ity condition, Studia Math., 178(1) (2007), 83–89
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Further Inequalities for the Numerical Radius of Hilbert Space Operators
New inequalities for numerical radius w(A) of Hilbert space operators are derived via convex functions, generalizing and improving results by El-Haddad and Kittaneh, including a bound for r≥2.