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HenrikRüping

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21
Example of an unnatural isomorphism
mathoverflow.net

19
Proving that a group is free
mathoverflow.net

17
The free group $F_2$ has index 12 in SL(2,$\mathbb{Z}$)
mathoverflow.net

16
Are there space filling curves for the Hilbert cube?
mathoverflow.net

13
Examples of common false beliefs in mathematics
mathoverflow.net

12
Homeomorphism-fixing subsets
mathoverflow.net

11
Results in linear algebra that depend on the choice of field
mathoverflow.net

11
Isomorphic morphisms. A 27-morphism category
mathoverflow.net

8
homotopy associative $H$-space and $coH$-space
mathoverflow.net

8
What is an explicit example of a sequence converging to two different points?
mathoverflow.net

8
Which functors preserve the number of connected components?
mathoverflow.net

7
Applications of homotopy groups of spheres
mathoverflow.net

7
The fundamental group of an $S^1$-quotient
mathoverflow.net

7
When is a extension of $\mathbb{Z}$ by a free group a CAT(0) group?
mathoverflow.net

7
Question about spectral sequences associated to filtered complexes with unbounded filtrations
mathoverflow.net

7
Visualizing hyperbolic metric of punctured sphere
mathoverflow.net

7
A mutation of the Collatz disease
mathoverflow.net

6
Integrability of derivatives
mathoverflow.net

6
Question about exotic spheres
mathoverflow.net

6
Examples of non-metrizable spaces
mathoverflow.net

6
An example of a regular but not linear-based topological space
mathoverflow.net

6
Massey Products on a specific space
mathoverflow.net

6
When are two semidirect products of two cyclic groups isomorphic
mathoverflow.net

5
How to solve $f(f(x)) = \cos(x)$?
mathoverflow.net

5
Topological description of Manifold with boundary
mathoverflow.net

5
Adem relations of Steenrod square without modding out the coboundaries
mathoverflow.net

5
Obstructions to $E_2$-algebra structure on $E_1$-algebra
mathoverflow.net