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$\begingroup$ Nice! works like a charm, so then the expression I want is then my original expression subtract the Select[expr, countN[#] == 0 &] so that all terms now have at least one $n_i$. As a novice to MMa, I can't really understand what the components of your function mean, could you elaborate on that maybe in your answer? $\endgroup$

CAF
– CAF

2018-08-20 15:29:48 +00:00
Commented Aug 20, 2018 at 15:29
$\begingroup$ @CAF Please, have a look at the edit $\endgroup$

Alexei Boulbitch
– Alexei Boulbitch

2018-08-20 15:58:14 +00:00
Commented Aug 20, 2018 at 15:58

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