Lisa S.'s user avatar
Lisa S.'s user avatar
Lisa S.'s user avatar
Lisa S.
  • Member for 7 years, 10 months
  • Last seen more than 2 years ago
16 votes
2 answers
1k views

Grothendieck spectral sequence when one of the functors is contravariant

13 votes
1 answer
730 views

Is there a unique commutative group structure on $\mathbb{G}_m$?

13 votes
2 answers
613 views

Infinitesimal deformations of the formal group of $\mathbb{G}_m$

13 votes
3 answers
1k views

Are there nonisotrivial elliptic curves over $\mathbb{G}_m$?

13 votes
0 answers
900 views

A slick proof (?) of Zariski-Nagata purity in characteristic $p$

12 votes
1 answer
638 views

Is every proper regular relative algebraic space curve over a Dedekind domain projective?

11 votes
3 answers
1k views

Quotient of a smooth curve by a finite group and differentials

10 votes
1 answer
631 views

Reinterpreting Galois descent over finite fields

10 votes
1 answer
1k views

A proper smooth surface is projective

8 votes
1 answer
919 views

Does the ring of invariants inherit normality?

8 votes
1 answer
385 views

Elliptic curves with the same mod $p$ representation

8 votes
1 answer
531 views

$p$-adic completeness of the ring of Witt vectors

7 votes
0 answers
171 views

How to compactify $\mathbb{Z}_p[x, y, z]/(xyz - p)$?

7 votes
2 answers
705 views

$p$-torsion of an abelian variety of $p$-rank $0$

7 votes
1 answer
405 views

Is an elliptic curve that is isomorphic to its Frobenius conjugate defined over $\mathbb{F}_p$?

7 votes
1 answer
581 views

Depth under localization over a Cohen-Macaulay ring

7 votes
0 answers
217 views

Embedding a given affine variety as a divisor

6 votes
0 answers
148 views

A lisse mixed sheaf as an extension of pure lisse sheaves

6 votes
1 answer
420 views

Extensions of an abelian variety by a torus vs. extensions of their $\ell$-adic Tate modules

5 votes
1 answer
203 views

The generic fiber pullback for $p$-divisible groups in characteristic $p$

5 votes
2 answers
965 views

Is a normal proper relative curve over a DVR projective?

5 votes
1 answer
664 views

Is the ring of invariants Noetherian?

5 votes
1 answer
628 views

Lie algebra and base change

5 votes
1 answer
645 views

Identifying the canonical principal polarization of a Jacobian

5 votes
0 answers
291 views

Ultrapower of a field is purely transcendental

4 votes
1 answer
414 views

Is a universally closed monomorphism a closed immersion?

4 votes
0 answers
162 views

Can nonflat deformations of singularities always produce Cohen-Macaulay rings?

4 votes
1 answer
610 views

An explicit formula for Weil pairing on a complex torus

4 votes
2 answers
222 views

Fixed space of the square of a symmetric matrix over $\mathbb{F}_2$

3 votes
1 answer
209 views

Interpreting Frobenius pullback as an invariant differential in the case of an elliptic curve