Document Type

Article

Department/Program

Mathematics

Journal Title

Operators and Matrices

Pub Date

2012

Volume

6

Issue

3

First Page

433

Abstract

Let y' be the set of n x n hermitian matrices, the set of n x n symmetric matrices, the set of all effects, or the set of all projections of rank one. Let c be a real number. We characterize bijective maps phi : y' -> y' satisfying tr (AB) = c double left right arrow tr (phi(A)phi(B)) = c with some additional restrictions on c, depending on the underlying set of matrices.

DOI

10.7153/oam-06-29

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