Roberto Frigerio

Member for 13 years, 6 months
Last seen more than a month ago

dm.unipi.it/~frigerio
Pisa, Italy

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21

How many elements does it take to normally generate a group?

Feb 10, 2011

18

Non-commutator in simple group?

May 1, 2012

14

Which knots are singularities of a hyperbolic cone-manifold structures on $S^3$?

Oct 10, 2018

13

Connections between ultrafilters in topology and logic

May 27, 2010

10

Do you know how to construct a compact hyperbolic 3-manifold with three or four totally geodesic boundary components?

May 20, 2010

Questions

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40

Homotopy groups of $S^2$

May 6, 2011

22

Geodesics on the sphere

Jan 14, 2019

18

The number of cusps of higher-dimensional hyperbolic manifolds

Sep 7, 2010

15

smooth sections of smooth fiber bundles

May 25, 2010

13

Fox differential calculus and the Alexander invariant of a link

Nov 13, 2011

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hyperbolic-geometry

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gr.group-theory

44

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gt.geometric-topology

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9

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3-manifolds

21

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4

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terminology

21

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+10

Do you know how to construct a compact hyperbolic 3-manifold with three or four totally geodesic boundary components?

+20

When does Cantor-Bernstein hold?

+10

Homotopy groups of $S^2$

+10

Quasi-isometric rigidity of Nil

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