User Thomas Kragh

15 votes

Does this approach for the Poincaré conjecture work?

answered May 7, 2010 at 10:33

11 votes

Accepted

Partition of R into midpoint convex sets

answered Apr 23, 2010 at 12:18

10 votes

Accepted

Good example of a non-continuous function all of whose partial derivatives exist

answered Mar 25, 2010 at 13:45

9 votes

Equality vs. isomorphism vs. specific isomorphism

answered May 12, 2010 at 21:38

9 votes

Accepted

smooth sections of smooth fiber bundles

answered May 25, 2010 at 14:29

8 votes

Accepted

Pullbacks in Category of Sets and Partial Functions

answered Apr 21, 2010 at 12:14

7 votes

Accepted

How to prove Arnold Conjecture without using S^1 localization?

answered Jun 18, 2013 at 13:19

7 votes

Accepted

Does $(M\times M, \omega\times -\omega)$ admit a Lagrangian fibration?

answered Mar 4, 2014 at 7:59

6 votes

Accepted

Can a continuous, nowhere differentiable function have specified "shape" at every point?

answered Mar 16, 2010 at 9:02

6 votes

Good reference for homology of $K(\mathbb{Z}, 2n)$?

answered Jun 8, 2010 at 12:31

6 votes

Are there topological obstructions to the existence of almost quaternionic structures on compact manifolds?

answered Jan 18, 2011 at 21:33

5 votes

Diameter of a circle in an embedded Riemannian manifold

answered Apr 26, 2010 at 11:44

5 votes

Do rational numbers admit a categorification which respects the following "duality"?

answered Apr 30, 2010 at 14:35

5 votes

What is the definition of "canonical"?

answered Mar 29, 2010 at 13:07

5 votes

Accepted

An algebraic Hamiltonian vector field with a finite number of periodic orbits(1)

answered Jan 31, 2014 at 13:02

4 votes

Area enclosed by x^4 + y^4 = 1

answered Jun 2, 2010 at 14:54

3 votes

Existence of Fermi coordinates on a Riemannian manifold

answered Mar 19, 2010 at 11:36

3 votes

use Floer homology to prove the fixed points

answered May 6, 2014 at 13:34

3 votes

Accepted

What is known about the strong Arnold conjecture?

answered Jun 18, 2013 at 14:49

2 votes

Accepted

Can symplectic blow up increase symplectic capacities?

answered Mar 21, 2014 at 13:52

2 votes

What are the correct axioms for a "weakly associative monoidal functor"?

answered Mar 17, 2010 at 11:48

1 vote

A problem concerning two symmetric matrices

answered Mar 30, 2010 at 12:53

1 vote

Accepted

If the second derivative of a function on $\mathbb R^n$ is everywhere nondegenerate, does it follow that the first derivative is an injection?

answered Apr 3, 2010 at 10:16

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23 Answers

Does this approach for the Poincaré conjecture work?

Partition of R into midpoint convex sets

Good example of a non-continuous function all of whose partial derivatives exist

Equality vs. isomorphism vs. specific isomorphism

smooth sections of smooth fiber bundles

Pullbacks in Category of Sets and Partial Functions

How to prove Arnold Conjecture without using S^1 localization?

Does $(M\times M, \omega\times -\omega)$ admit a Lagrangian fibration?

Can a continuous, nowhere differentiable function have specified "shape" at every point?

Good reference for homology of $K(\mathbb{Z}, 2n)$?

Are there topological obstructions to the existence of almost quaternionic structures on compact manifolds?

Diameter of a circle in an embedded Riemannian manifold

Do rational numbers admit a categorification which respects the following "duality"?

What is the definition of "canonical"?

An algebraic Hamiltonian vector field with a finite number of periodic orbits(1)

Area enclosed by x^4 + y^4 = 1

Existence of Fermi coordinates on a Riemannian manifold

use Floer homology to prove the fixed points

What is known about the strong Arnold conjecture?

Can symplectic blow up increase symplectic capacities?

What are the correct axioms for a "weakly associative monoidal functor"?

A problem concerning two symmetric matrices

If the second derivative of a function on $\mathbb R^n$ is everywhere nondegenerate, does it follow that the first derivative is an injection?