- #1
Chronos000
- 80
- 0
Homework Statement
The question asks for [Xi^2, Lj]
I can get to the line:
ih(bar) Xk ekjl Xl + ih(bar) ekjl Xk Xl
this line must be zero but I don't see how it is.
It looks like an expansion of a commutation between Xk and Xl but not quite right