> 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. ThiƩry "Isil" <[EMAIL PROTECTED]>
http://Nicolas.Thiery.name/

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