Matrix Inequalities between $f(A)\sigma f(B)$ and $A\sigma B$

Manisha Devi, Jaspal Singh Aujla, Mohsen Kian +1

Let $A$ and $B$ be $n\times n$ positive definite complex matrices, let $\sigma$ be a matrix mean, and let $f:[0,\infty )\to [0,\infty )$ be a differentiable convex function with $f(0)=…