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Idempotents and Landweber exactness in brave new algebra

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.

Homology, Homotopy and Applications, Vol. 3(2), 2001, pp. 355-359

http://www.rmi.acnet.ge/hha/volumes/2001/n2a4/v3n2a4.dvi (ps, dvi.gz, ps.gz, pdf)
ftp://ftp.rmi.acnet.ge/pub/hha/volumes/2001/n2a4/v3n2a4.dvi (ps, dvi.gz, ps.gz, pdf)