Jensen's operator inequality

Frank Hansen, Gert K. Pedersen

Research output: Contribution to journalArticlepeer-review

118 Citations (Scopus)


Jensen's operator inequality and Jensen's trace inequality for real functions defined on an interval are established in what might be called their definitive versions. This is accomplished by the introduction of genuine non-commutative convex combinations of operators, as opposed to the contractions considered in earlier versions of the theory by the authors, and by Brown and Kosaki. As a consequence, one no longer needs to impose conditions on the interval of definition. It is shown how this relates to the pinching inequality of Davis, and how Jensen's trace inequality generalizes to C*-algebras.

Original languageEnglish
Pages (from-to)553-564
Number of pages12
JournalBulletin of the London Mathematical Society
Issue number4
Publication statusPublished - 2003 Jul

ASJC Scopus subject areas

  • Mathematics(all)


Dive into the research topics of 'Jensen's operator inequality'. Together they form a unique fingerprint.

Cite this