ON {\lambda}-Commuting Operators
  In this paper, we study the operator equation $AB=\lambda BA$ for a bounded operator $A,B$ on a complex Hilbert space. We focus on algebraic relations between different operators that include normal, $M$-hyponormal, quasi $*$-paranormal and other classes. 
Abdelaziz Tajmouati, Abdeslam El Bakkali, M.B. Mohamed Ahmed
math.SP math.FA