To be used in future
 Section A.7: Commutators Up Appendix A: Useful Mathematics Section A.9: Standard Matrices 

A.8 Anticommutators

Anticommutators between objects (be they matrices or operators) are defined as We find the following useful relations (commonly used in commutator algebra), that express commutators of complicated objects in terms of anticommutators and
as well as
 Section A.7: Commutators Up Appendix A: Useful Mathematics Section A.9: Standard Matrices