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## Main Question or Discussion Point

Hello everyone,

I will be glad if someone can explain how equation 7.7

[tex]\tilde{x}(E)[/tex] = [tex]\tilde{q}(E)[/tex] + [tex]\frac{\tilde{f}(E)}{E^2-\omega^2+i\epsilon}[/tex]

is a shift by constant, heres the link for the book

http://www.physics.ucsb.edu/~mark/ms-qft-DRAFT.pdf

thanks

I will be glad if someone can explain how equation 7.7

[tex]\tilde{x}(E)[/tex] = [tex]\tilde{q}(E)[/tex] + [tex]\frac{\tilde{f}(E)}{E^2-\omega^2+i\epsilon}[/tex]

is a shift by constant, heres the link for the book

http://www.physics.ucsb.edu/~mark/ms-qft-DRAFT.pdf

thanks