What precisely are $E_{\infty}$ ring spaces and $E_{\infty}$ ring spectra?

Details What precisely are $E_{\infty}$ ring spaces and $E_{\infty}$ ring spectra? What precisely are $E_{\infty}$ ring spaces and $E_{\infty}$ ring spectra?

2009-03-16

arxiv.org/abs/0903.2813v1

Mathematics

Algebraic Topology

52 pages. To appear in Geometry and Topology (Banff Conference Proceedings)

Scientific paper

E infinity ring spectra were defined in 1972, but the term has since acquired several alternative meanings. The same is true of several related terms. The new formulations are not always known to be equivalent to the old ones and even when they are, the notion of "equivalence" needs discussion: Quillen equivalent categories can be quite seriously inequivalent. Part of the confusion stems from a gap in the modern resurgence of interest in E infinity structures. E infinity ring spaces were also defined in 1972 and have never been redefined. They were central to the early applications and they tie in implicitly to modern applications. We summarize the relationships between the old notions and various new ones, explaining what is and is not known. We take the opportunity to rework and modernize many of the early results. New proofs and perspectives are sprinkled throughout.

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