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Thank you for the previous response.

Now I have another strange problem. I write
TR[GA[mu]GA[nu]],

and obtain zero instead of 4g[mu,nu]. I've also tried

Tr[DiracMatrix[mu]DiracMatrix[nu]],

TR[DiracMatrix[mu]DiracMatrix[nu]],

and in all cases the result is zero. What can be the reason for this? Similar problem appear when considering more complicated traces.

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