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For questions about ring spectra (in homotopy theory).

11 votes
Accepted

Is there essentially unique notion of module over monoidal stable $\infty$-categories?

The ∞-categorical analog of the fact you mention can be found in Higher Algebra, corollary 7.3.4.14: Let $\operatorname{CAlg}$ be the category of $E_\infty$-rings and $A\in \operatorname{CAlg}$. Then …
Denis Nardin's user avatar
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7 votes
Accepted

Morphisms from $bstring$ to $X\otimes \mathbb{Q}$ and sequences $s_n\in\pi_n(X)\otimes \math...

This is an assemblage of known results, I'll try to put a reference for all of them. By a classical theorem of Serre all stable homotopy groups are finite in positive degree. In particular we have $ …
Denis Nardin's user avatar
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11 votes

What is the symmetric monoidal structure on the $(\infty,1)$-category of spectra?

Let me add a short observation to Dylan's fantastic answer. There is indeed a more concrete construction of the symmetric monoidal structure on the $\infty$-category of spectra: it is the localized Da …
Denis Nardin's user avatar
  • 16.5k