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Questions
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Is there an additive model of the stable homotopy category?

dec 13 11 at 20:48 Mike Shulman 17.2k●20●70

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Hamiltonian circle actions and Lefschetz pencils

jul 29 11 at 19:18 Weiwei 161●1●4

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What does the classifying space of a category classify?

may 7 10 at 18:27 Allen Knutson 12.4k●1●23●64

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Why can’t the Klein bottle embed in $\mathbb{R}^3$?

mar 22 10 at 12:35 Sam Nead 5,302●12●26

 
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Resolution of a free lie algebra as a module over its universal enveloping algebra.

mar 3 10 at 9:41 Torsten Ekedahl 17.9k●1●42●68