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# Questions

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### Irreducible polynomials with constrained coefficients

dec 27 09 at 0:29 Bjorn Poonen 14.2k24775

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### Contractability of Exotic R^4s

mar 16 11 at 0:22 MathOverflow 123

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### What’s so difficult about $\pi_{15}(SO)$?

jul 22 11 at 17:09 some guy on the street 1,543412

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### About higher Ext in R-Mod

feb 11 10 at 18:44 some guy on the street 1,543412

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### The most general context of Mather’s Cube Theorems

mar 3 12 at 16:09 Jacob Lurie 6,2592436

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### A curious construction of a chain complex and its homology

dec 29 10 at 21:56 Noah Stein 4,3511926

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### Limits are terminal objects in another category; (when) are they colimits of (another diagram)?

apr 7 11 at 21:02 David Carchedi 7,7071027

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### Status of the Isomorphism problem for automatic groups?

dec 17 at 1:16 Andy Putman 18.3k355118

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### Topological Localization of (the simply-connected cover of) SO or Spin

may 25 11 at 9:37 Tilman 3,83241326

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