Dear combinat-developers,
for my research I would lik to study the species of series-parallel
networks.
In EOIS as sloane.A006351 they propose the combstruct-code
spec := [ N, {N=Union(Z, S, P), S=Set(Union(Z, P), card>=2),
P=Set(Union(Z, S), card>=2)}, labeled ]:
How can I make that using sage-combinat?
A search in the reference manual did not help, so I hope you can help
me.
(by the way: there seems to be a typo in the manual. As operations on
Species
the second item should read "Product Species" and not "Sum Species")
Thank you for your help.
Frank
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