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# Questions

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### Do torsors give a long exact sequence of cohomology?

feb 11 at 13:57 René Pannekoek 1,092312

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### How do you compute the primes of bad reduction?

dec 13 at 17:57 François Brunault 7,42911335

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### Surjectivity of reduction maps of elliptic curves over Q

nov 24 at 1:25 René Pannekoek 1,092312

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### Are ranks of Jacobians over number fields unbounded?

nov 19 at 21:53 Felipe Voloch 16.6k23661

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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 1,092312

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