FermionChain is a FeynArts objects for denoting closed fermion
chains and as such it is not present in FeynCalc. To convert it
to FeynCalc, replace FermionChain by DOT.
> I have an expression generated by FeynArts like FermionChain[a,b,...].
> when i multiply it by it\\\'s complex conjugate and act upon the result FermionSpinSum command I don\\\'t get the wanted trace expression, just a copy of the input. Any ideas what\\\'s wrong?
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