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