Name: Saurabh Rindani Date: 05/24/06-12:32:18 PM Z

Hello,

I find that in using FermionSpinSum I often get an error message

“MIST”

followed by an expression without FermionSpinSum evaluated.

One example of such an occurrence is when one of the factors inside FermionSpinSum is a sum of terms, each being a matrix sandwiched between spinors. But there are also other cases.

Can you tell me what is going wrong? (And what does MIST mean?)

Thanks.

Best regards,
Saurabh