Thank you for your reply. But my question is how to show "the time ordering operation" of two spacetime points x and x' is frame independent if their separation is timelike.
I attached the following paragraph from Srednicki's book for your reference. Please click the attachment for clarity.
Hello, everyone
I am studying Srednicki's "Quantum Field Theory", section 4 "The spin-statistics Theorem".
Does anyone know how to show that "The time ordering of two spacetime points x and x' is frame independent if their separation is timelike."(P32), explicitly?
And "Two spacetime points...