Roberto Frigerio's user avatar
Roberto Frigerio's user avatar
Roberto Frigerio's user avatar
Roberto Frigerio
  • Member for 13 years, 9 months
  • Last seen more than 1 year ago
41 votes
2 answers
5k views

Homotopy groups of $S^2$

22 votes
15 answers
6k views

Geodesics on the sphere

18 votes
3 answers
1k views

The number of cusps of higher-dimensional hyperbolic manifolds

15 votes
3 answers
2k views

smooth sections of smooth fiber bundles

13 votes
1 answer
2k views

Fox differential calculus and the Alexander invariant of a link

11 votes
2 answers
713 views

Quasi-isometric rigidity of Nil

10 votes
1 answer
1k views

Two questions about sphere bundles

10 votes
1 answer
1k views

Alexandrov angles in Riemannian manifolds

7 votes
4 answers
1k views

Examples of "exotic" induction

7 votes
1 answer
398 views

Smooth functions on subsets of $\mathbb{R}^n$

5 votes
0 answers
281 views

Two natural maps asssociated with the nerve of a cover

5 votes
2 answers
445 views

A name for a weak topology

3 votes
1 answer
642 views

Homology boundary links

2 votes
3 answers
1k views

Reference for the geometry of horospheres

0 votes
0 answers
172 views

Existence of special pants decompositions for non-elementary representations into PSL(2,R)