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Questions
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Surjectivity of reduction maps of elliptic curves over Q

nov 24 at 1:25 René Pannekoek 1,212●3●13

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Do torsors give a long exact sequence of cohomology?

feb 11 at 13:57 René Pannekoek 1,212●3●13

 
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Geometrically unirational varieties that are not unirational

1d ago Jason Starr 1,935●9●15

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E an elliptic curve over Z[1/N], how many p such that E(Z/p^2) = (Z/p)^2?

feb 13 at 13:36 René Pannekoek 1,212●3●13

 
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Spreading out of flat morphisms of schemes

feb 26 12 at 17:34 Laurent Moret-Bailly 7,366●19●29

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Are ranks of Jacobians over number fields unbounded?

nov 19 at 21:53 Felipe Voloch 16.7k●2●36●61

 
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How do you compute the primes of bad reduction?

dec 13 at 17:57 François Brunault 7,634●1●14●37