Nowadays I have calculted some quantity including Dirac Matrix.
My question is as follows:
In 'Feyncalc', we don't need to write IdentityMatrix?
For example, I want to express
where GS[p] is 4-dim matrix, but a is scalar. Actually
a is not a scalar but a*IdentityMatrix. So my question
is : what is right ?
2. GS[p]+a IdentityMatrix
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