Preservers for the p -Norm of Linear Combinations of Positive Operators
Gergő Nagy · Abstract and Applied Analysis · 2014
We describe the structure of those transformations on certain sets of positive operators which preserve thep-norm of linear combinations with given nonzero real coefficients. These sets are the collection of all positivepth Schatten-class operators and the set of its normalized elements. The results of the work generalize, extend, and unify several former theorems.