Thank you!
The way you suggested partly solved my problem, but if I wanna take trace with something mixing with GSD, the ReplaceAll then doesn't work well.
I now treat my problem with some clumsy way and the steps are as follows:
first, I finish taking trace in D-dimension, and let the result shown in StandardForm;
then, I replace all Ds with 4s and thus bring DiracTrace with GA[5] back to 4 dimension;
finally, I simplify the results from the 2nd step with DiracSimplify and obtain the final result I want.
In my example, the prescription above works however of course it's an ugly way at the same time...
Best regards!
BWL
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