I don't understand why you need to close FeynCalc to compute something.
Integrate2 and DeltaFunction are FeynCalc objects and become meaningless
to Mathematica when FeynCalc is not loaded.
Mathematica can calculate
Integrate[DiracDelta[y - x] y, {x, 0, 1}]
independently of FeynCalc being loaded or not.
Am 11.12.2017 um 11:52 schrieb sten:
> my problem is
>
> In[33]:= Integrate2[DeltaFunction[y - x] y , {x, 0, 1}]
>
> Out[33]= y Hold[Integrate3][\[Delta](y-x),{x,0,1}]
>
> I think I cannot write more than one symbolic variable in the DeltaFunction but it should be symbolic in my computation.
> However, mathematica can compute this but I have to close FeynCalc. Is there any way?
>
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