When applied to simple models, large N expansion is not very tricky, however I would like to know if it is possible to automatize this process to don't expend much time in such calculations.
Andrew James Bruce
The only thing that I am aware of, and I will stress is that I have never used it, is the FeynCalc package. I don't know if you can use those tools to build routines that you need. I suppose that you might you already know of this package.
Anyway, good luck.
https://feyncalc.github.io/
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