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Positivity, Betweenness, and Strictness of Operator Means

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  • Pattrawut Chansangiam

Abstract

An operator mean is a binary operation assigned to each pair of positive operators satisfying monotonicity, continuity from above, the transformer inequality, and the fixed-point property. It is well known that there are one-to-one correspondences between operator means, operator monotone functions, and Borel measures. In this paper, we provide various characterizations for the concepts of positivity, betweenness, and strictness of operator means in terms of operator inequalities, operator monotone functions, Borel measures, and certain operator equations.

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  • Pattrawut Chansangiam, 2015. "Positivity, Betweenness, and Strictness of Operator Means," Abstract and Applied Analysis, Hindawi, vol. 2015, pages 1-5, May.
    • Handle: RePEc:hin:jnlaaa:851568
    DOI: 10.1155/2015/851568
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    Cited by:

    1. Pattrawut Chansangiam, 2015. "A Survey on Operator Monotonicity, Operator Convexity, and Operator Means," International Journal of Analysis, Hindawi, vol. 2015, pages 1-8, November.

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