Hello,
I've just stumbled across definition 2.3.2 (weighted set). I must say
that looks surprisingly similar to the definition of a combinatorial
class in Molinero's thesis.
Nicolas, do you see a difference?
O course the \mathbb{A} is the natural numbers in Molinero, but I am
sure also that can be generalised.
See also Example 1 on the page before.
Ralf
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