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## Main Question or Discussion Point

On page 96, he defined [itex]\psi'(x')=S\psi(x)[/itex], but it seems what he later derived for S only transforms the spinor part not the space-time coordinate of the 4-component wave function, then how is the space-time coordinate primed after acted by S? I'm pretty sure it's not a typo according to what he did on page101, eqns (3.158)~(3.161).