We’re rewarding the question askers & reputations are being recalculated! Read more.

For questions concerning the theory and applications of combinatorial species, the endofunctors of the category of finite sets and bijections, and the calculus thereof.

For questions regarding the theory and applications of combinatorial species, the endofunctors of the category of finite sets and bijections, as well as Goodwillie's calculus of species (and alternative systems of species operations).

This field is also referred to as species theory.

history | excerpt history