comes with an action[note 1] of the symmetric group
The category of combinatorial species is equivalent to the category of finite
-sets (roughly because the permutation category is equivalent to the category of finite sets and bijections.
of finite-dimensional vector spaces over a field k of characteristic zero (the symmetric groups act from the right by convention).
-module determines a Schur functor on
-module shares its name with the considerably better-known model for highly structured ring spectra due to Elmendorf, Kriz, Mandell and May.
This topology-related article is a stub.