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user7090
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72 votes
5 answers
7k views

Why should I care about adjoint functors

  • 4,520
52 votes
6 answers
9k views

Famous papers in algebraic geometry

48 votes
2 answers
5k views

What is the intuition between 1-cocycles (group cohomology)?

22 votes
2 answers
7k views

Geometric interpretation and computation of the Normal bundle

  • 1,171
14 votes
2 answers
4k views

automorphism of the projective space $\mathbb{P}_A^n$

  • 2,143
12 votes
1 answer
1k views

Physicist trying to understand GIT quotient

  • 2,119
11 votes
1 answer
824 views

Formula for decomposing a form into $(p,q)$ forms

9 votes
1 answer
3k views

Rank of projective module

  • 273
8 votes
1 answer
923 views

Geometric significance of completion of a ring

  • 5,217
8 votes
3 answers
3k views

Bijection between Extensions and Ext (Weibel Theorem 3.4.3)

7 votes
2 answers
503 views

How is the notion of adjunction of two functors usefull?

  • 804
6 votes
0 answers
220 views

How can I compute simple examples of the associated vector bundle to a coherent sheaf?

  • 2,993
6 votes
0 answers
197 views

Infinitesimal deformation of projective schemes

  • 941
6 votes
1 answer
1k views

Isotrivial family: different definitions

4 votes
1 answer
92 views

Existence of a Cech cover for computing Picard group

  • 1,247
4 votes
1 answer
354 views

Derivations vs automorphisms of deformations

4 votes
1 answer
614 views

Test for a $G$-torsor to be trivial?

  • 541
2 votes
2 answers
196 views

Flows on a manifold as a group action.

  • 5,217
2 votes
0 answers
61 views

How does isomorphism of schemes induce maps on cohomology groups

  • 1,835
2 votes
0 answers
964 views

Comparing two definitions of determinant of coherent sheaves

  • 389
1 vote
2 answers
516 views

Group of k-Algebra Automorphisms over a Polynomial Ring

  • 289
0 votes
2 answers
502 views

pullback of global sections with respect to an automorphism of schemes