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Hi,

In advance I want to thank any help and sorry if my question is silly but I am new in FC.

Currently I am using FC to evaluate traces like:

d1[a_, b_, c_] :=

Tr[GSD[a].GAD[\[Alpha]].GSD[a + b].GAD[\[Mu]].GSD[

a + b + c].GAD[\[Nu]].GSD[a + b].GAD[\[Alpha]]]

and what I want is to replace any argument of the function with a four vector defined in the following way:

e*P[\mu]+f*k[\mu]

where e and f are scalars to be defined later. The above expression comes from a Sudakov-type decomposition of the original vectors.

Thanks again for any help.

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