
Recent Posts
Recent Comments
metric2011 on Notes of Sa’ar Hersonsky… CH on Videos Stefan Wenger on Notes of Stefan Wenger’s… Stefan Wenger on Notes of Stefan Wenger’s… Stefan Wenger on Notes of Stefan Wenger’s… Archives
 October 2017
 June 2017
 May 2017
 April 2017
 March 2017
 February 2017
 January 2017
 March 2016
 February 2016
 October 2015
 August 2015
 February 2015
 November 2014
 October 2014
 September 2014
 June 2014
 May 2014
 April 2014
 March 2014
 February 2014
 January 2014
 December 2013
 November 2013
 October 2013
 July 2013
 May 2013
 February 2013
 December 2012
 November 2012
 October 2012
 September 2012
 July 2012
 June 2012
 May 2012
 April 2012
 March 2012
 February 2012
 January 2012
 September 2011
 August 2011
 April 2011
 March 2011
 February 2011
 January 2011
Categories
Meta
Monthly Archives: June 2012
Notes of Christophe Pittet’s lecture
Spheres in horospheres 1. The result Conjecture. filling is exponential for non uniform irreducible lattices in rank lattices. Thurston did it for . Wortman solved the conjecture in most cases for simple ambient groups, when the rank is maximal. Theorem … Continue reading
Notes of Nicholas Touikan’s lecture
Hierarchical accessibility of relatively hyperbolic groups joint with Lars Louder Let be hyperbolic relative to some family P of parabolic subgroups. Assume is torsion free (non 2torsion would suffice). Let be an elementary family of subgroups. could be trivial, , … Continue reading
Notes of Bogdan Nica’s lecture
Proper isometric actions of hyperbolic groups on spaces As far as affine isometric actions on spaces, hyperbolic groups may have Kazhdan’s property, Haagerup property, or neither. As far as affine isometric actions on spaces, Yu’s theorem asserts that Theorem 1 … Continue reading
Notes of Alain Valette’s Lille lecture
Graphs of groups and the Haagerup property joint with Yves Cornulier 1. The Haagerup property 1.1. Basics Definition 1 has Haagerup property if it has a proper affine sometric action on some Hilbert space. Gromov calls them aTmenable. Example 1 … Continue reading
Notes of Robert Young’s lecture
Filling functions and nonpositive curvature Continuation of Leuzinger’s talk. I will bring support to his conjecture and explain why it is so hard. And then describe some preliminary results. 1. and is the semidirect product of by acting by diagonal … Continue reading
Notes of Yves Cornulier’s lecture
Dehn functions of Lie groups joint with Romain Tessera Sample application to finitely generated groups: The Dehn function of a polycyclic group is either exponential or at most polynomial. 1. Basic facts Dehn function makes sense for compactly presented locally … Continue reading
Posted in Uncategorized
Leave a comment
Notes of Kevin Wortman’s lecture
Cohomology of arithmetic groups over function fields I show that , a prime field, virtually has infinite . 1. The problem More generally, we deal with finite extensions of (functions on ), like (functions on an elliptic curve). And rings … Continue reading