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R.P.'s user avatar
R.P.'s user avatar
R.P.
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15 Questions

Score Activity Newest Views
78 votes
0 answers
3k views

The exponent of Ш of $y^2 = x^3 + px$, where $p$ is a Fermat prime

17 votes
2 answers
2k views

Origin of the term "Diophantine equation"

14 votes
2 answers
2k views

Surjectivity of reduction maps of elliptic curves over Q

12 votes
0 answers
259 views

Galois groups of classical differential equations

11 votes
2 answers
753 views

Geometrically unirational varieties that are not unirational

10 votes
1 answer
574 views

Brauer-Manin obstruction on an open subset of an elliptic curve

8 votes
1 answer
447 views

How do you compute the primes of bad reduction?

7 votes
1 answer
911 views

Do torsors give a long exact sequence of cohomology?

7 votes
2 answers
490 views

Are ranks of Jacobians over number fields unbounded?

7 votes
2 answers
470 views

Obstruction to rationality of del Pezzo surfaces of degree 4

6 votes
1 answer
509 views

Is the following consequence of the Lang conjecture known?

6 votes
1 answer
313 views

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

5 votes
1 answer
913 views

Spreading out flat morphisms of schemes

5 votes
2 answers
1k views

Singular models of K3 surfaces

5 votes
2 answers
427 views

In what sense can we "describe" the rational points on a unirational surface?