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Suppose I have do something like this :

nprop = (MTD[\[Rho], \[Sigma]] -

FVD[l, \[Rho]] FVD[l, \[Sigma]]/SPD[l, l])

ss4 = Calc[GAD[\[Rho]].GSD[k].GSD[q].GAD[\[Sigma]].nprop] //

DiracSimplify

In this next step, I want to apply :

s5 = ss4 /. {SPD[l, q] GSD[l] -> GSD[q] SPD[l, l]/D}

How do I make this substitution to work?

-Purnendu

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