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Jan
24 |
awarded | Nice Answer |
Dec
19 |
awarded | Yearling |
Mar
29 |
reviewed | Approve Functions on hyperbolic space and modular curves |
Mar
21 |
reviewed | Approve Injective dimension of cyclic modules |
Mar
20 |
reviewed | Approve Commutation of tensor products with inverse limits in a specific case |
Mar
14 |
answered | A question on polynomial heights |
Dec
19 |
awarded | Yearling |
Nov
27 |
reviewed | Approve Isomorphism problem for two radical extensions |
Nov
26 |
reviewed | Approve Simplifying triangulations of 3-manifolds |
Oct
9 |
answered | When the contraction is a morphism defined over $\overline{\mathbb Q}$ |
Jul
31 |
comment |
K3 surfaces that correspond to rational points of elliptic curves
@LevBorisov Are you aware of the work of Kudla and recent work of Darmon and others? It might have some connection to what you're looking for. |
Jul
30 |
comment |
K3 surfaces that correspond to rational points of elliptic curves
The field of definition of the point $P$ on $X_0(n)^+$ should probably correspond to the field of the definition of the corresponding divisor on the K3 surface. So saying that it comes from a $\bf{Q}$ point just means that the Picard group of the K3 can be fully realized over a small degree number field (here, probably the $2$-torsion field of the elliptic curves). |
Jul
30 |
comment |
K3 surfaces that correspond to rational points of elliptic curves
It seems that the K3 is not the Kummer, but is is a double cover (i.e. related by a Shioda-Inose structure to the product abelian surface). See theorem 7.6 of that paper. |
May
9 |
comment |
Elliptic surfaces with different Kodaira symbols
At least in characteristic not 2 or 3 this is impossible: the elliptic fibration is unique for Kodaira dimension 1. For char 2 or 3 you may have to consider quasi-elliptic fibrations, and I haven't thought through it. |
May
8 |
answered | Lattice polarized K3 surfaces |
May
8 |
comment |
Lattice polarized K3 surfaces
No, the Picard rank can be anywhere between 1 and 20, for a lattice polarized K3 surface. |
Mar
28 |
reviewed | Approve On a particular case of the ``Tumura-Hayman" theorem : |
Jan
30 |
reviewed | Reject Cohomology after completion |
Jan
16 |
comment |
Commutativity of convex hulls and closed balls
I believe I now have a counterexample - see above. |
Jan
16 |
revised |
Commutativity of convex hulls and closed balls
added 1351 characters in body |