Stefan Witzel's user avatar
Stefan Witzel's user avatar
Stefan Witzel's user avatar
Stefan Witzel
  • Member for 12 years, 8 months
  • Last seen more than a month ago
23 votes
1 answer
2k views

Rock-paper-scissors...

15 votes
3 answers
1k views

Axioms for constructive Euclidean geometry

14 votes
2 answers
2k views

Symplectic K-theory

14 votes
0 answers
208 views

Hauptvermutung for non-manifolds

11 votes
1 answer
330 views

Arithmetic groups and integral points of integral structures

11 votes
3 answers
457 views

Quasi-isometric groups without common virtual geometric model

9 votes
6 answers
733 views

Homology software

9 votes
0 answers
320 views

Infinite-dimensional torsion-free $F_\infty$-group not containing $F$

9 votes
1 answer
196 views

Kazhdan's property (T) for $\tilde{C}_2$-lattices

8 votes
1 answer
1k views

Cohomology of Grothendieck topology

6 votes
1 answer
737 views

Monoids and groups of fractions

5 votes
0 answers
157 views

Homology of a semisimplicial scheme

5 votes
0 answers
136 views

Lattices of minimal covolume in $\operatorname{SL}_2(\mathbb{R}) \times \operatorname{SL}_2(\mathbb{R})$

5 votes
0 answers
164 views

Non-algebraic quasi-isometric embeddings

4 votes
2 answers
271 views

Quadratic diophantine equations and geometry of numbers

4 votes
1 answer
105 views

Classes of curves closed under Minkowsky sum

3 votes
0 answers
331 views

Character table of the symmetric group $S_n$ according to James

3 votes
0 answers
151 views

Rational power series and extensions