•Leading order non-OPI

With opi set to False, this check cannot be done.

(lowestOrder1 - (lowestOrder1 /. CouplingConstant[QED[_], ___] -> 0) // manred[MandelstamU]) // Simplify

0

CouplingConstant[QED[1], RenormalizationState[0]]^2 (MandelstamU - MandelstamT)/MandelstamS + CouplingConstant[QED[1], RenormalizationState[0]]^2 (MandelstamU - MandelstamS)/MandelstamT // manred[MandelstamU] // Simplify

-(2 (e^( ))^2 (s^2 + t s + t^2 - 2 (s + t) (m _ π^+^(ó  r ))^2))/(s t)

Converted by Mathematica  (July 10, 2003)