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aglearner
  • Member for 13 years
  • Last seen more than a week ago
218 votes
8 answers
33k views

How to memorise (understand) Nakayama's lemma and its corollaries?

194 votes
18 answers
15k views

Great graduate courses that went online recently

74 votes
5 answers
13k views

Is there a "geometric" intuition underlying the notion of normal varieties?

56 votes
9 answers
7k views

Examples in mirror symmetry that can be understood.

29 votes
15 answers
5k views

Lunch seminars for PhD students

22 votes
6 answers
7k views

A finitely generated $\mathbb{Z}$-algebra that is a field has to be finite

19 votes
2 answers
2k views

The geometric median of a triangle

18 votes
1 answer
1k views

The group of isometries of a manifold is a Lie group, isn't it?

17 votes
5 answers
858 views

Rigidity of convex polyhedrons in $\mathbb R^3$ with faces removed

17 votes
6 answers
7k views

Explaining the concept of projective space: notes for students

15 votes
2 answers
4k views

A geometric reference for (affine) Gorenstein varieties and singularities

15 votes
0 answers
382 views

Extending Kahler metric from a neighborhood of a divisor to the whole manifold

15 votes
1 answer
502 views

Lines passing through many points of the form $(c^n,c^m)$

14 votes
5 answers
2k views

Reading list for Equivariant Cohomology

14 votes
1 answer
798 views

An almost complex structure on $S^2\times ...\times S^2 / \mathbb{Z_2}$

14 votes
2 answers
597 views

A "holomorphic" Peano curve?

14 votes
3 answers
1k views

Injective morphism from curves to $\mathbb CP^2$

13 votes
4 answers
2k views

"Classical" consequences of Bezout's theorem in dimensions $>2$

13 votes
2 answers
4k views

"Arithmetic genus" of a plane curve singularity.

13 votes
1 answer
528 views

Complex curves covered by smooth plane curves

13 votes
3 answers
1k views

How to disjoint two cycles with zero intersection?

13 votes
1 answer
1k views

Today's world record on the Betti numbers of Calabi-Yau three-folds.

13 votes
1 answer
856 views

Colourings of $\mathbb Q\times \mathbb Q$ in three colours

13 votes
3 answers
2k views

Linear algebra underlying quantum entanglement?

12 votes
1 answer
738 views

Bounds on the lowest dimension of a faithful representation of a finite group

12 votes
3 answers
1k views

Two equivalent irreducible representations given by integer matrices

12 votes
4 answers
2k views

A question on deformations of Theta divisor in the Jacobian of a complex curve

12 votes
9 answers
6k views

Proofs of Mordell-Weil theorem

11 votes
1 answer
526 views

Length decreasing homotopies of curves

10 votes
2 answers
518 views

Two smooth tangent almost complex curves in a $4$-manifold

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