REFINEMENTS OF SOME WELL-KNOWN NUMERICAL RADIUS INEQUALITIES

FADI ALRIMAWI, Fuad Kittaneh

Abstract


In this article, we obtain some numerical radius inequalities that

reÖne the well-known inequality w(A) kAk using the Cauchy-Schwarz in-
equality, a generalization of Buzanoís inequality, and the mixed Schwarz in-
equality. Also, we prove some numerical radius inequalities for Önite sums of

operators that include functions of speciÖc characters.


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