Characterization of Bistochastic Kadison–Schwarz Operators on M2(C)

Farrukh Mukhamedov, Hasan Akın

Research output: Contribution to journalArticlepeer-review


Abstract: We characterize bistochastic Kadison–Schwarz operators acting on M2(C). The obtained characterization allows us to find positive operators that are not Kadison–Schwarz ones. Moreover, we provide several examples of Kadison–Schwarz operators which are not completely positive.

Original languageEnglish
Pages (from-to)165-177
Number of pages13
JournalProceedings of the Steklov Institute of Mathematics
Issue number1
Publication statusPublished - Jul 2021


  • Kadison–Schwarz operator
  • bistochastic mapping
  • complete positivity

ASJC Scopus subject areas

  • Mathematics (miscellaneous)


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