Birgit Richter

"On obstruction theory for Einfty structures"

Abstract: Very recently Alan Robinson constructed an obstruction theory for Einfty structures on ring spectra. The obstruction groups for these multiplicative structures on a homotopy commutative ring spectrum live in topological André-Quillen homology of the dual of the Steenrod algebra of the spectrum. We will describe his obstruction theory and apply it to give an easy proof that the Lubin-Tate spectra possess an Einfty structure.