Alex Saad's user avatar
Alex Saad's user avatar
Alex Saad's user avatar
Alex Saad
  • Member for 9 years, 4 months
  • Last seen more than 4 years ago
  • Oxford, United Kingdom
30 votes
0 answers
1k views

Sheaves of categories

18 votes
1 answer
3k views

Do schemes help us understand elliptic curves?

14 votes
1 answer
2k views

Symmetric tensor decomposition in higher tensor powers

14 votes
1 answer
1k views

Details in applying the Barr-Beck monadicity theorem to Tannakian reconstruction

13 votes
1 answer
985 views

The étale fundamental group as a functor

12 votes
2 answers
316 views

What is known about the numbers $M_p = \left\vert C(\mathbb{F}_p )\right\vert$?

11 votes
1 answer
985 views

Is there a "logical algebraic geometry" based on provability rather than truth?

9 votes
1 answer
365 views

"Lifting" fibres of morphism of arithmetic schemes to get rid of "nongeometric" ramification

9 votes
2 answers
732 views

Why are invertible objects reflexive in a tensor category?

9 votes
1 answer
1k views

Can a separable isogeny of elliptic curves have an inseparable dual?

9 votes
1 answer
419 views

Why care about the $(\infty, 1)$-category of topological spaces?

8 votes
1 answer
685 views

The canonical height of a point on an elliptic curve

7 votes
2 answers
722 views

Solving exercise 1.10 in Silverman's AEC

7 votes
1 answer
243 views

Why do we need the infinite field hypothesis in this cohomology calculation?

6 votes
1 answer
155 views

Affine scheme obtained from (commutative) group algebra

6 votes
1 answer
328 views

Surjectivity of linear map between "naive" and "abstract" Zariski tangent spaces

6 votes
1 answer
496 views

Moduli spaces, stacks and homotopy theory

5 votes
1 answer
1k views

What's so special about hyperbolic curves?

5 votes
1 answer
719 views

The "ring of characters" of a finite group and its automorphisms

5 votes
2 answers
456 views

$K$-homomorphisms from an étale $K$-algebra to a field

5 votes
1 answer
376 views

Why do these open subgroups of the étale fundamental group contain the kernel of an induced homomorphism?

5 votes
0 answers
315 views

Two questions on homotopy sequence for étale fundamental groups

5 votes
0 answers
196 views

The hypothetical fibre over an infinite prime in $\mathbb{A}^1_{\mathbb{Z}}$

4 votes
1 answer
282 views

Motivation for orbifold base points

4 votes
1 answer
254 views

Reference request: Fibre functor for elliptic curves is pro-representable

4 votes
1 answer
546 views

Monodromy action and profinite completion of fundamental group

4 votes
2 answers
282 views

The rigid additive tensor category freely generated by an object

4 votes
0 answers
295 views

How to recover a $K$-algebra from endomorphism algebra of forgetful functor?

4 votes
2 answers
264 views

Epimorphisms and faithful functors in a rigid abelian tensor category

4 votes
2 answers
882 views

Why does $\operatorname{Proj}(B)$ not contain ideals containing the irrelevant ideal?