Formal plethories

Details Formal plethories Formal plethories

2011-07-28

arxiv.org/abs/1107.5745v1

Mathematics

Algebraic Topology

50 pages

Scientific paper

Unstable operations in a generalized cohomology theory E give rise to a functor from the category of algebras over E to itself which is a colimit of representable functors and a comonoid with respect to composition of such functors. In this paper I set up a framework to study the algebra of such functors, which I call formal plethories. I show that the "logarithmic" functors of primitives and indecomposables give linear approximations of formal plethories by bimonoids in the 2-monoidal category of bimodules over a ring.

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