### 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>