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# Questions

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### How to correct an error in a submitted paper?

apr 22 10 at 7:46 Matthew Daws 5,5471829

8
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### Why are profinite topologies important?

mar 4 12 at 0:41 Benjamin Steinberg 10.8k11449

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558
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### Brown representability for non-connected spaces

aug 19 at 20:44 Karol Szumiło 1,67848

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### Can equivalences be strictified to isomorphisms?

mar 27 12 at 17:39 Mike Shulman 17.4k2172

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### How many proofs that $\pi_n(S^n)=\mathbb{Z}$ are there?

17h ago Johannes Ebert 11.6k3356

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### Can ZFC → NBG be iterated?

jan 6 11 at 20:44 Mike Shulman 17.4k2172

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522
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### Small complete categories in a Grothendieck topos

dec 31 10 at 22:17 Steven Gubkin 6,20322663

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651
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### Logical endofunctors of Set?

dec 9 09 at 1:36 Joel David Hamkins 76.8k8192355

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### When does collection imply replacement?

jan 22 10 at 2:57 Joel David Hamkins 76.8k8192355

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