Examples of disk algebras
classification
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math.KT
keywords
ringsspectrumactionalgebrasbrown--petersoncircleconsequentlydisk
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We produce refinements of the known multiplicative structures on the Brown--Peterson spectrum $BP$, its truncated variants $BP\langle n \rangle$, Ravenel's spectra $X(n)$, and evenly graded polynomial rings over the sphere spectrum. Consequently, topological Hochschild homology relative to these rings inherits a circle action.
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Cited by 1 Pith paper
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Universal Properties of Variations of the Little Cubes Operads
Proves universal property for parametrized little cubes operad E_B showing it as colimit of E_n over B, with descent for factorization algebras.
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