User evgeny

26 votes

1 answer

1k views

Why there is a Quot-scheme, not a Sub-scheme?

asked Nov 7, 2016 at 9:31

18 votes

1 answer

3k views

Why is Mumford's GIT-quotient so effective?

asked Oct 29, 2016 at 14:03

15 votes

4 answers

1k views

Application of toric varieties for problems that do not mention them

asked Mar 4, 2017 at 23:11

13 votes

0 answers

287 views

Actions of $\mathbb Z/2\mathbb Z$ on algebraically closed fields and even-dimensional spheres and parallel between Galois theory and covering theory

asked Oct 29, 2016 at 19:11

13 votes

3 answers

693 views

Ring of invariants of $\operatorname{SL}_6$ acting on $\Lambda^3 \mathbb C^6$

asked Dec 20, 2016 at 20:41

9 votes

1 answer

455 views

Is this sequence of Lie algebra cohomology a part of spectral sequence?

asked Feb 21, 2017 at 17:40

9 votes

1 answer

1k views

Reference request: tangent space to moduli space of coherent sheaves is $\operatorname{Ext}^1(E, E)$

asked Oct 31, 2016 at 20:32

9 votes

0 answers

527 views

Is a quotient of a solvable group always affine?

asked Feb 14, 2017 at 18:29

8 votes

0 answers

683 views

How to calculate the top Chern class of a "functorial" vector bundle on a moduli space of sheaves?

asked Nov 8, 2016 at 22:23

7 votes

0 answers

225 views

Phantom category with trivial Hochschild cohomology

asked May 18, 2017 at 20:56

6 votes

1 answer

500 views

Do topological spaces form a full subcategory of spectra?

asked Dec 15, 2016 at 13:09

6 votes

2 answers

573 views

Is there an analogue of CW-complexes built from $K(\mathbb Z, n)$ instead of $S^n$?

asked Nov 24, 2016 at 16:10

6 votes

2 answers

639 views

Reference request: an example of Bott residue formula's usage

asked Nov 2, 2016 at 9:07

5 votes

3 answers

549 views

Reference request: correspondence between central simple algebras and quadratic forms

asked Dec 7, 2016 at 10:21

5 votes

0 answers

143 views

Geometrical meaning of Atiyah-Bredon exact sequence in equivariant cohomology

asked Feb 26, 2017 at 18:18

5 votes

1 answer

393 views

Normal form of elliptic curves via symmetric polynomials

asked Dec 24, 2016 at 12:51

5 votes

1 answer

321 views

Supposed generalization of $X/(G \times H)\simeq (X/G)/H$ for GIT-quotients

asked Oct 18, 2016 at 20:32

4 votes

1 answer

628 views

Vector bundles on quotient variety

asked Oct 2, 2016 at 12:04

4 votes

1 answer

656 views

Moment map for complete flags variety

asked Dec 21, 2016 at 18:14

4 votes

0 answers

350 views

How should one understand shifted Lie algebras, like $T_X[-1]$?

asked Sep 8, 2017 at 9:06

3 votes

0 answers

304 views

Resolving structure sheaf of diagonal via universal bundle on moduli space

asked Mar 15, 2017 at 8:03

2 votes

0 answers

87 views

If Lie algebra cohomology $H^2(g, M)=Ext^2_{U(g)}(k, M)$ classify $M$-extensions of $g$, are they $Ext^1_?(g, M)$ for some category?

asked Feb 20, 2017 at 7:31

Stack Exchange Network

22 Questions

Why there is a Quot-scheme, not a Sub-scheme?

Why is Mumford's GIT-quotient so effective?

Application of toric varieties for problems that do not mention them

Actions of $\mathbb Z/2\mathbb Z$ on algebraically closed fields and even-dimensional spheres and parallel between Galois theory and covering theory

Ring of invariants of $\operatorname{SL}_6$ acting on $\Lambda^3 \mathbb C^6$

Is this sequence of Lie algebra cohomology a part of spectral sequence?

Reference request: tangent space to moduli space of coherent sheaves is $\operatorname{Ext}^1(E, E)$

Is a quotient of a solvable group always affine?

How to calculate the top Chern class of a "functorial" vector bundle on a moduli space of sheaves?

Phantom category with trivial Hochschild cohomology

Do topological spaces form a full subcategory of spectra?

Is there an analogue of CW-complexes built from $K(\mathbb Z, n)$ instead of $S^n$?

Reference request: an example of Bott residue formula's usage

Reference request: correspondence between central simple algebras and quadratic forms

Geometrical meaning of Atiyah-Bredon exact sequence in equivariant cohomology

Normal form of elliptic curves via symmetric polynomials

Supposed generalization of $X/(G \times H)\simeq (X/G)/H$ for GIT-quotients

Vector bundles on quotient variety

Moment map for complete flags variety

How should one understand shifted Lie algebras, like $T_X[-1]$?

Resolving structure sheaf of diagonal via universal bundle on moduli space

If Lie algebra cohomology $H^2(g, M)=Ext^2_{U(g)}(k, M)$ classify $M$-extensions of $g$, are they $Ext^1_?(g, M)$ for some category?