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Alex's user avatar
Alex
  • Member for 12 years, 11 months
  • Last seen more than a month ago
111 votes
1 answer
2k views

Tate conjecture for Fermat varieties

13 votes
1 answer
619 views

Converting an infinite product to sum; Ramanujan $\tau$ function

12 votes
1 answer
618 views

Where does this elliptic curve come from?

11 votes
1 answer
4k views

Convexity and equality in Jensen's inequality

10 votes
2 answers
1k views

Ramanujan's Tau function, an arithmetic property

10 votes
1 answer
8k views

Show that the norm of the multiplication operator $M_f$ on $L^2[0,1]$ is $\|f\|_\infty$

10 votes
1 answer
598 views

Relation between congruence subgroups. $\Gamma(M)\Gamma(N) = \Gamma(\gcd(M,N))$

7 votes
1 answer
4k views

Terminology: A homomorphism factors

7 votes
1 answer
751 views

Basics of schemes and morphisms of schemes

6 votes
1 answer
1k views

Resolution of singularities (small resolution)

6 votes
1 answer
2k views

Upper semi-continuity and lower semi-continuity of particular functions

5 votes
2 answers
1k views

Calabi-Yau Manifolds

5 votes
0 answers
1k views

A special case of Young's inequality for convolutions

5 votes
1 answer
454 views

Relationship between two distinct notions for divisors on curves

4 votes
3 answers
213 views

Normal subgroup of $\operatorname{SL}_2(K)$

4 votes
1 answer
921 views

Linearly disjoint field extensions and the tensor product

4 votes
0 answers
374 views

Fundamental group of a space under a group action

3 votes
0 answers
375 views

Resolving threefold quotient singularities without the quotient

3 votes
1 answer
470 views

Constructing a rational map between two elliptic curves

3 votes
2 answers
467 views

Detecting preperiodic points

3 votes
2 answers
406 views

Intersection of all compact sets of measure 1 in a measure space

2 votes
1 answer
223 views

Bounding $p$-adic valuations in inequality

1 vote
2 answers
273 views

Example/counter example of a particular set being an ideal