Thanks for the solution. It works for me.
> eval(e1, [name(pos)], [2], [(x : eI) : eI +-> x])
For the interested readers of this thread here is the documentation of the
last eval call:
eval: (%, List Symbol, List NonNegativeInteger, List % -> %) -> % if R has
Ring
eval(x, [s1, ..., sm], [n1, ..., nm], [f1, ..., fm]) replaces every
si(a)^ni in x by fi(a) for any a.
Thanks.
Slawomir
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