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# Questions

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### What do coherent topoi have to do with completeness?

may 17 at 4:03 StephenK1 1

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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 15.2k23085

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

jan 1 at 7:37 Tom Goodwillie 27k262111

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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 19k34793

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

sep 29 at 19:58 Tyler Lawson 19k34793

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### What do cohomology operations have to do with the non-existence of commutative cochains over $\mathbb{Z}$?

sep 21 at 12:26 Justin Young 16313

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

aug 24 at 21:19 quasi-coherent 50436

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### Acyclic models via model categories?

aug 11 at 18:02 Akhil Mathew 12.1k22989

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