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# Questions

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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 14.1k25482

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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 38917

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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 8,42921848

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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 8,13912256

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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 38917

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