Some means inequalities for positive operators in Hilbert spaces

J Inequal Appl. 2017;2017(1):14. doi: 10.1186/s13660-016-1283-x. Epub 2017 Jan 10.

Abstract

In this paper, we obtain two refinements of the ordering relations among Heinz means with different parameters via the Taylor series of some hyperbolic functions and by the way, we derive new generalizations of Heinz operator inequalities. Moreover, we establish a matrix version of Heinz inequality for the Hilbert-Schmidt norm. Finally, we introduce a weighted multivariate geometric mean and show that the weighted multivariate operator geometric mean possess several attractive properties and means inequalities.

Keywords: Hilbert space; means inequalities; positive linear operators.