Revision history [back]
 | 1 | initial version |
Like this (one has to tell the valuation now).
sage: X = species.SingletonSpecies()
sage: E = species.SetSpecies()
sage: A = CombinatorialSpecies(min=1)
sage: A.define(X*E(A))
sage: A
Combinatorial species with min=1
sage: A.generating_series()[0:4]
[0, 1, 1, 3/2]
