Reverse Cauchy--Schwarz inequalities for positive C*-valued sesquilinear forms

preprint2009arXivOpen access

Abstract

We prove two new reverse Cauchy--Schwarz inequalities of additive and multiplicative types in a space equipped with a positive sesquilinear form with values in a C*-algebra. We apply our results to get some norm and integral inequalities. As a consequence, we improve a celebrated reverse Cauchy--Schwarz inequality due to G Polya and G. Szego.

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