Transformations preserving the norm of means between positive cones of general and commutative $C^{\ast }$-algebras

Yunbai Dong, Lei Li, Lajos Molnar +1

In this paper, we consider a (nonlinear) transformation $\Phi$ of invertible positive elements in $C^{\ast }$-algebras which preserves the norm of any of the three fundamental means of posi…