@MISC{May01idempotentsand, author = {J.P. May}, title = {IDEMPOTENTS AND LANDWEBER EXACTNESS IN BRAVE NEW ALGEBRA}, year = {2001} }

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Abstract

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.