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# Questions

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### What is a simplicial commutative ring from the point of view of homotopy theory?

jan 11 at 21:42 André Henriques 14.9k23083

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### Are spectra really the same as cohomology theories?

jan 1 at 7:37 Tom Goodwillie 26.8k258110

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### Smashing localizations in the category of spectra

nov 22 at 19:08 John Palmieri 1,8241715

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### Is a wedge of spheres an $E_\infty$ ring spectrum?

nov 2 at 5:04 Tyler Lawson 18.7k24490

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### $\mathbb{Z}/2$-action on spectra given by inversion

sep 29 at 19:58 Tyler Lawson 18.7k24490

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### Fundamental group of the moduli stack of elliptic curves

aug 24 at 21:19 quasi-coherent 49436

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### What is the upper shriek in Grothendieck duality in the non-proper case?

aug 2 at 22:49 Jacob Bell 70517

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### Reference on the question mark cell complex

jul 21 at 21:47 Eric Peterson 2,93411428

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### Is there an algebro-geometric description of $\nu$?

jul 17 at 20:35 Akhil Mathew 12k22889

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