Operators and Matrices · Volume 6, Issue 3 Preservers of matrix pairs with a fixed inner product value 06-29 Pages 433-464 DOI 10.7153/oam-06-29 Downloads Short PDF Full PDF PNG Authors Chi-Kwong Li Lucijan Plevnik Peter Šemrl Keywords Hermitian matrix real symmetric matrix projection effect trace preserver Subject classes 15A86 15B57