User aglearner

10 votes

1 answer

628 views

Almost complex structures on $\mathbb CP^2$ that are not tamed

asked Feb 15, 2017 at 17:04

10 votes

3 answers

2k views

A question about an application of Molien's formula to find the generators and relations of an invariant ring

asked Mar 12, 2011 at 20:28

10 votes

1 answer

489 views

Visualising locally flat embeddings of surfaces in R^4

asked Nov 23, 2012 at 20:35

10 votes

2 answers

1k views

Proofs of circle packing theorem

asked Aug 25, 2020 at 10:02

10 votes

0 answers

193 views

Holomorphic versus algebraic $\mathbb C^*$-actions

asked Jun 4, 2019 at 11:06

10 votes

0 answers

455 views

Exotic analytic triangulations of $S^5$?

asked May 6, 2021 at 12:32

9 votes

3 answers

1k views

$\mathbb CP^k$ bundles over $\mathbb CP^n$ are projectivisations of vector bundles. Any reference?

asked Nov 30, 2019 at 16:54

9 votes

1 answer

591 views

Do all Fano threefolds have effective $c_2$?

asked Apr 7, 2018 at 15:26

9 votes

1 answer

537 views

Injective morphism from an elliptic curve to $\mathbb CP^2$.

asked Feb 27, 2013 at 16:32

9 votes

1 answer

1k views

Fixing a mistake in "An introduction to invariants and moduli"

asked Mar 22, 2011 at 17:30

9 votes

3 answers

2k views

If a polynomial f is irreducible then (f) is radical, without unique factorization?

asked Mar 8, 2011 at 9:35

9 votes

1 answer

3k views

What is "augmented algebra"?

asked Feb 12, 2012 at 0:10

9 votes

5 answers

512 views

A terminological question concerning orbifolds.

asked Apr 17, 2012 at 22:13

9 votes

1 answer

651 views

Reeb flows on $S^3$ versus volume preserving flows

asked Jan 12, 2017 at 1:19

9 votes

1 answer

316 views

Variety $X$ such that $TX$ is ample on any curve in $X$

asked Sep 11, 2013 at 13:07

9 votes

1 answer

545 views

Pontryagin numbers on manifolds with an $S^1$-action

asked Dec 11, 2013 at 22:16

9 votes

1 answer

304 views

Minimal number of intersection of curves in $\mathbb P^2$

asked Feb 10, 2014 at 10:33

9 votes

0 answers

146 views

A characterization of Moishezon manifolds via sections of $L^k$ with $k\to \infty$

asked Jul 19, 2017 at 14:19

9 votes

1 answer

581 views

Smoothing of a Kähler orbifold metric on a complex surface

asked Apr 13, 2017 at 12:27

8 votes

0 answers

242 views

Lifting $\mathbb C^*$ actions to holomorphic bundles

asked May 10, 2017 at 11:09

8 votes

2 answers

394 views

Maps to $K(\pi,1)$ spaces from manifolds with $S^1$-action

asked Mar 28, 2017 at 14:57

8 votes

1 answer

2k views

A "geometric" insight into a proof of Krull intersection theorem?

asked Oct 8, 2012 at 17:19

8 votes

2 answers

476 views

Fundamental groups of normal complex quasi-projective varieties

asked Jun 13, 2013 at 15:08

8 votes

0 answers

213 views

A classification of smooth $S^1$-actions on $\mathbb CP^3$?

asked Sep 10, 2013 at 0:17

8 votes

1 answer

216 views

Rational smooth complex projectives three fold with non-rational deformation

asked Dec 7, 2012 at 12:03

8 votes

3 answers

877 views

Picture of 18 smooth reflexive polytopes of dimension 3

asked Apr 7, 2018 at 15:16

8 votes

0 answers

294 views

$c_2$ of Calabi-Yau three-folds

asked Jan 2, 2019 at 13:04

8 votes

1 answer

506 views

What are quadric bundles?

asked May 18, 2019 at 16:02

8 votes

1 answer

2k views

What is a conic bundle and why is it called so?

asked May 19, 2019 at 9:07

8 votes

2 answers

478 views

Can one disjoin any submanifold in $\mathbb R^n$ from itself by a $C^{\infty}$-small isotopy?

asked Dec 4, 2018 at 11:53

Stack Exchange Network

209 Questions

Almost complex structures on $\mathbb CP^2$ that are not tamed

A question about an application of Molien's formula to find the generators and relations of an invariant ring

Visualising locally flat embeddings of surfaces in R^4

Proofs of circle packing theorem

Holomorphic versus algebraic $\mathbb C^*$-actions

Exotic analytic triangulations of $S^5$?

$\mathbb CP^k$ bundles over $\mathbb CP^n$ are projectivisations of vector bundles. Any reference?

Do all Fano threefolds have effective $c_2$?

Injective morphism from an elliptic curve to $\mathbb CP^2$.

Fixing a mistake in "An introduction to invariants and moduli"

If a polynomial f is irreducible then (f) is radical, without unique factorization?

What is "augmented algebra"?

A terminological question concerning orbifolds.

Reeb flows on $S^3$ versus volume preserving flows

Variety $X$ such that $TX$ is ample on any curve in $X$

Pontryagin numbers on manifolds with an $S^1$-action

Minimal number of intersection of curves in $\mathbb P^2$

A characterization of Moishezon manifolds via sections of $L^k$ with $k\to \infty$

Smoothing of a Kähler orbifold metric on a complex surface

Lifting $\mathbb C^*$ actions to holomorphic bundles

Maps to $K(\pi,1)$ spaces from manifolds with $S^1$-action

A "geometric" insight into a proof of Krull intersection theorem?

Fundamental groups of normal complex quasi-projective varieties

A classification of smooth $S^1$-actions on $\mathbb CP^3$?

Rational smooth complex projectives three fold with non-rational deformation

Picture of 18 smooth reflexive polytopes of dimension 3

$c_2$ of Calabi-Yau three-folds

What are quadric bundles?

What is a conic bundle and why is it called so?

Can one disjoin any submanifold in $\mathbb R^n$ from itself by a $C^{\infty}$-small isotopy?