Refinements of Choi – Davis – Jensen ’ S Inequality

  title={Refinements of Choi – Davis – Jensen ’ S Inequality},
  author={Maryam Khosravi and Jaspal Singh Aujla and Sever Silvestru Dragomir and Mohammad Sal Moslehian},
Let Φ1, . . . ,Φn be strictly positive linear maps from a unital C∗algebra A into a C∗-algebra B and let Φ = ∑n i=1 Φi be unital. If f is an operator convex function on an interval J , then for every self-adjoint operator A ∈ A with spectrum contained in J , the following refinement of the Choi– Davis–Jensen inequality holds: