Name: Rolf Mertig (email_not_shown)
Date: 03/25/05-08:39:36 PM Z

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Hello,

this:

nospinors[x_] := x /.
{Spinor[__] :> Sequence[],
SpinorU[__] :> Sequence[], SpinorUBar[__] :>
Sequence[],
SpinorV[__] :> Sequence[], SpinorVBar[__] :>
Sequence[]};

InputForm[
FCE[nospinors[Calc[SpinorUBar[p1, m] .
(GS[p1] + GS[q] - m) . SpinorUBar[p2, m]]]]]

will return
GS[q]

Regards, Rolf

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