User aglearner

6 votes

1 answer

414 views

$H^1(X,O_X)$, holomorphic $1$-forms, and $b_1(X)/2$ for normal $X$.

asked Apr 22, 2013 at 8:50

6 votes

3 answers

872 views

An element $g$ in a group such that neither $g=1$ nor $g\ne 1$ can be proved.

asked Feb 17, 2013 at 15:00

6 votes

2 answers

265 views

Fixed component of an $S^1$ action on $S^n$

asked Aug 28, 2013 at 19:44

6 votes

0 answers

321 views

Elementary questions about Morse-Bott functions

asked Nov 16, 2018 at 14:32

6 votes

1 answer

293 views

Riemann-Hurwitz for real maps

asked Dec 18, 2019 at 17:39

6 votes

2 answers

308 views

Rational maps from $\mathbb CP^n$ to $\mathbb CP^{n-1}$, fixing $\mathbb CP^{n-1}$

asked Feb 9, 2021 at 17:51

5 votes

1 answer

219 views

A limit of conjugate representations in $\mathrm{GL}(n,\mathbb C)$

asked Nov 18, 2020 at 13:58

5 votes

1 answer

147 views

Fixed subspaces of a family of representations $\rho_t: F_2\to GL(n,\mathbb C)$

asked Jun 23, 2021 at 17:32

5 votes

2 answers

422 views

Invariant theory over $\mathbb R$

asked Jul 4, 2021 at 9:54

5 votes

1 answer

861 views

On imaginary time

asked Jul 18, 2022 at 8:13

5 votes

1 answer

223 views

Proof of Lemma 37.5 in Pak's Lectures on Discrete and Polyhedral Geometry

asked Jan 5, 2023 at 10:25

5 votes

1 answer

339 views

Equations for dual cubic curves

asked Aug 28 at 14:19

5 votes

1 answer

242 views

Untangling two simple closed curves on a surface

asked Sep 12, 2020 at 22:40

5 votes

1 answer

266 views

$S^1$-quotient of the space of unbased contractible loops of a finite dimensional $K(\pi,1)$

asked Apr 2, 2018 at 19:47

5 votes

1 answer

509 views

Finite groups admitting free isometric actions on round spheres

asked May 9, 2012 at 13:05

5 votes

1 answer

452 views

Actions of finite groups on exotic smooth manifolds of dimension >4

asked May 9, 2012 at 17:34

5 votes

3 answers

578 views

A classification of non-associative algebras with a norm?

asked Jun 9, 2012 at 7:32

5 votes

5 answers

4k views

Unique factorisation and the fact that $\mathbb A^2-0$ is not an affine variety?

asked Mar 5, 2011 at 22:23

5 votes

1 answer

344 views

Fano blow ups of $\mathbb CP^n$

asked Mar 15, 2017 at 12:51

5 votes

1 answer

255 views

Almost complex structures on a 4-ball that are not tamed

asked Mar 2, 2017 at 1:30

5 votes

1 answer

255 views

Image of a hypersurface under a map $\mathbb CP^n\to \mathbb CP^n$

asked Feb 25, 2014 at 21:52

5 votes

1 answer

312 views

Non-vanishing of elements in cohomology of full Flag varieties

asked Jul 21, 2014 at 14:45

5 votes

2 answers

684 views

Action of automorphisms of a $K3$ surface on its $(-2)$-curves

asked Oct 31, 2013 at 11:27

5 votes

1 answer

164 views

Connectedness of sub-varieties via Hilbert polynomials

asked Feb 7, 2014 at 12:08

5 votes

1 answer

142 views

Short basis in $\pi_1$ on a hyperbolic surface of bounded diameter

asked Mar 2, 2018 at 11:54

5 votes

1 answer

388 views

The space of contractible loops of a finite dimensional $K(\pi,1)$

asked Mar 31, 2018 at 10:18

5 votes

1 answer

153 views

An estimate on deviation of two smooth tangent $J$-holomorphic curves

asked Apr 1, 2018 at 10:32

5 votes

1 answer

270 views

Varying a Kahler metric in a neighborhood of a point

asked Oct 8, 2017 at 21:22

5 votes

0 answers

163 views

On homeomorphisms non-smooth along submanifolds

asked Jun 16, 2017 at 18:12

5 votes

1 answer

172 views

Resolving $\mathbb Z_n$ action on $\mathbb C^2$

asked Jun 20, 2017 at 10:31

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209 Questions

$H^1(X,O_X)$, holomorphic $1$-forms, and $b_1(X)/2$ for normal $X$.

An element $g$ in a group such that neither $g=1$ nor $g\ne 1$ can be proved.

Fixed component of an $S^1$ action on $S^n$

Elementary questions about Morse-Bott functions

Riemann-Hurwitz for real maps

Rational maps from $\mathbb CP^n$ to $\mathbb CP^{n-1}$, fixing $\mathbb CP^{n-1}$

A limit of conjugate representations in $\mathrm{GL}(n,\mathbb C)$

Fixed subspaces of a family of representations $\rho_t: F_2\to GL(n,\mathbb C)$

Invariant theory over $\mathbb R$

On imaginary time

Proof of Lemma 37.5 in Pak's Lectures on Discrete and Polyhedral Geometry

Equations for dual cubic curves

Untangling two simple closed curves on a surface

$S^1$-quotient of the space of unbased contractible loops of a finite dimensional $K(\pi,1)$

Finite groups admitting free isometric actions on round spheres

Actions of finite groups on exotic smooth manifolds of dimension >4

A classification of non-associative algebras with a norm?

Unique factorisation and the fact that $\mathbb A^2-0$ is not an affine variety?

Fano blow ups of $\mathbb CP^n$

Almost complex structures on a 4-ball that are not tamed

Image of a hypersurface under a map $\mathbb CP^n\to \mathbb CP^n$

Non-vanishing of elements in cohomology of full Flag varieties

Action of automorphisms of a $K3$ surface on its $(-2)$-curves

Connectedness of sub-varieties via Hilbert polynomials

Short basis in $\pi_1$ on a hyperbolic surface of bounded diameter

The space of contractible loops of a finite dimensional $K(\pi,1)$

An estimate on deviation of two smooth tangent $J$-holomorphic curves

Varying a Kahler metric in a neighborhood of a point

On homeomorphisms non-smooth along submanifolds

Resolving $\mathbb Z_n$ action on $\mathbb C^2$