Idempotents and Landweber exactness in brave new algebra, by J.P. May

We explain how idempotents in homotopy groups give rise to splittings of homotopy categories of modules over commutative S-algebras, and we observe that there are naturally occurring equivariant examples involving idempotents in Burnside rings. We then give a version of the Landweber exact functor theorem that applies to MU-modules. Appeared in: Homology, homotopy, and applications 3 (2001) 355-359.


J.P. May <may@math.uchicago.edu>