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# Questions

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### (Homotopy theory) When does the 2 of 3 property not imply 2 of 6?

feb 5 at 23:49 Tom Goodwillie 26.6k258110

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### Immersions of Topoi

dec 29 at 17:33 Jesse Wolfson 54827

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### Are connected categories with pullbacks weakly contractible?

jul 3 at 14:25 Jesse Wolfson 54827

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### Example of a Sheaf (on the site of smooth manifolds) with Nontrivial Cohomology on $\mathbb{R}^n$?

apr 18 12 at 14:11 Jesse Wolfson 54827

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### Software for Computing Baker-Campbell-Hausdorff

nov 3 11 at 10:09 robot 1,647312

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### Survey of Algebraic K-Theory Since 1980?

jun 28 11 at 19:05 Benjamin Antieau 2,336918

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### Nerves of simplicial objects in categories/Waldhausen’s S-construction

sep 19 11 at 14:14 Ilias 293

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