Perspectives and completely positive maps

Frank Hansen

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We study the filtering of the perspective of a regular operator map of several variables through a completely positive linear map. By this method we are able to extend known operator inequalities of two variables to several variables, with applications in the theory of operator means of several variables. We also extend Lieb and Ruskai's convexity theorem from two to n + 1 operator variables for any natural number n.

Original languageEnglish
Pages (from-to)168-176
Number of pages9
JournalAnnals of Functional Analysis
Issue number2
Publication statusPublished - 2017


  • Lieb and Ruskai's convexity theorem
  • Partial traces of operator means

ASJC Scopus subject areas

  • Analysis
  • Anatomy
  • Algebra and Number Theory


Dive into the research topics of 'Perspectives and completely positive maps'. Together they form a unique fingerprint.

Cite this