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Questions
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Does the following “symmetric” 2nd cohomology group of a finite group with coefficients in $Z_2$ always vanish?

oct 13 at 8:32 Bruce Bartlett 389●1●7

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How can one express the Dedekind eta function as a sum over the lattice?

oct 18 10 at 5:01 Richard Borcherds 14.1k●2●54●82

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How can one “see” the Hopf fibration in the space of lattices in the plane?

oct 17 10 at 22:46 Bruce Bartlett 389●1●7

 
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Does the function which sends a right angled triangle to its area produce infinitely many numbers having hardly any prime factors?

jul 18 10 at 20:19 David Hansen 8,429●2●18●48

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What do the numbers G_4 and G_6 of a lattice actually measure?

feb 17 10 at 2:38 Steve Huntsman 8,139●1●22●56

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Is the Fell-Doran problem trivial in a topological setting?

nov 16 09 at 20:05 Andrew Stacey 16k●1●40●110