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Questions
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Is there an interpretation of the “anticommutative” symmetric monoidal structure on $\mathbb{Z}$-graded abelian groups in terms of $\mathbb{G}_m$ actions?

mar 13 11 at 16:55 Theo Johnson-Freyd 22.2k●2●27●110

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Why is the symmetric monoidal structure on invertible modules strict?

sep 20 10 at 18:18 Eric Wofsey 8,860●1●26●46

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Do the signs in Puppe sequences matter?

dec 1 09 at 19:33 Hal Sadofsky 406●2●4

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When can you desuspend a homotopy cogroup?

nov 11 09 at 17:28 Reid Barton 14.4k●1●28●85

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Faithfully flat descent over Hopf algebras in terms of comodule structures

nov 17 09 at 2:12 Greg Kuperberg 36.2k●2●116●179

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Is a map that is locally fiberwise equivalent to a product a Hurewicz fibration?

oct 27 09 at 17:51 Eric Wofsey 8,860●1●26●46

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Commutativity in K-theory and cohomology

mar 5 10 at 16:12 Steve Huntsman 8,139●1●22●56

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Why is the Euler characteristic of powers of a line bundle a polynomial in the power?

feb 25 10 at 15:03 Anton Geraschenko♦♦ 13.7k●3●48●108

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How can you tell if a space is homotopy equivalent to a manifold?

jul 29 10 at 20:58 John Klein 7,103●19●28