Jensen's Inequality and majorization

Jorge Antezana, Pedro Massey, Demetrio Stojanoff

Let $\mathcal{A}$ be a $C^{\ast }$-algebra and $ϕ:\cA\to L(H)$ be a positive unital map. Then, for a convex function $f:I\to \mathbb{R}$ defined on some open interval and a self-adjoint…