> since I was asked to, I'll try to clarify my ideas to marry finite group
> actions with species.
Thanks, that definitely helps!
> .. two basic species
> ..........................................................
> The species of set partitions is probably more complicated, it is
> already quite complicated when the group acting is a Young subgroup
> S_n1 x S_n2 x ... But maybe Robert's code could help here.
Do you mean ordered or unordered set partitions? That is do you
distinguish between the two following set partitions of {1,2,3}?
[{1,2} {3}] and [{3}, {1,2}]
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <[EMAIL PROTECTED]>
http://Nicolas.Thiery.name/
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