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I don't know if this is the right section to ask for such a question but I have been dealing with this problem for a while and there's something I still cannot grasp...

Let us suppose that we have a dirac free particle with propagator (i'm sorry but i'm not able to obtain the feynman slash notation in TeX)

suppose [tex] p = (p_0, P)[/tex]

[tex] {i \over p/ - m} = i {p_0 \gamma_0 - P \cdot \gamma + m \over p_0^2 - P^2 -m^2} [/tex]

My question is how can I perform a non relativistic expansion and recover the non relativistic propagator

[tex] {1 \over E - {P^2 \over 2 m}} [/tex]

with E as the kinetic energy?

I have a couple of ideas quite long to write down, but I cannot justify them completely so I'd accept some hint gladly :)

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# Non relativistic limit for dirac propagator

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