= What precisely are E infinity ring spaces and E infinity ring spectra? by J. P. May
{c}
{tag=Work by J. P. May}
{title2=2009}
Primary author PDF: https://math.uchicago.edu/~may/PAPERS/Final1.pdf
Geometry and Topology Monographs 16, pages 215–282. DOI: https://doi.org/10.2140/gtm.2009.16.215
Sections 2 and 5 fix the countably infinite inner-product universe, finite-subspace indexing and the strict indexed-spectrum model. The text uses the mathematical symbol E infinity in its title; the source-card spelling keeps a stable readable identifier.
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