$Γ$-cohomology of rings of numerical polynomials and $E_\infty$ structures on K-theory

Details $Γ$-cohomology of rings of numerical polynomials and $E_\infty$ structures on K-theory $Γ$-cohomology of rings of numerical polynomials and $E_\infty$ structures on K-theory

2003-04-29

arxiv.org/abs/math/0304473v3

Mathematics

Algebraic Topology

Revised version, to appear in Commentarii Math. Helv

Scientific paper

We investigate Gamma-cohomology of some commutative cooperation algebras E_*E associated with certain periodic cohomology theories. For KU and E(1), the Adams summand at a prime p, and for KO we show that Gamma-cohomology vanishes above degree 1. As these cohomology groups are the obstruction groups in the obstruction theory developed by Alan Robinson we deduce that these spectra admit unique E infinity structures. As a consequence we obtain an E infinity structure for the connective Adams summand. For the Johnson-Wilson spectrum E(n) with n > 0 we establish the existence of a unique E infinity structure for its I_n-adic completion.

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