# Group Actions Seminar

The Group Actions Seminar (previously known as the Infinite Groups Seminar) covers topics such as totally disconnected groups, geometric group theory, lattices, rigidity, buildings and group actions on trees. The seminar meets several times a year, usually at the University of Sydney but sometimes at other universities in the area. The mailing list carries updates and reminders as new seminars are announced.

 Tuesday 6 November 2018 (Carslaw 375, The University of Sydney) 11:00am – Noon Jeroen Schillewaert (Auckland) On Exceptional Lie Geometries 2:00 – 3:00pm Bernhard Muehlherr (Giessen) Root graded groups Tuesday 23 October 2018 (Carslaw 357, Carslaw 373, The University of Sydney) 11:00am – Noon Adam Piggott (Queensland) On groups presented by length-reducing rewriting systems 2:00 – 3:00pm Yusra Naqvi (Sydney) Reconstructing simplicial group actions Tuesday 6 March 2018 (Carslaw 373, The University of Sydney) 11:00am – Noon Colva Roney-Dougal (St Andrews) The generating graph of a finite group 2:00 – 3:00pm Alejandra Garrido (Düsseldorf) Profinite completions of groups acting on rooted trees Wednesday 23 August (Carslaw 352, Carslaw 375, The University of Sydney) 11:00am – Noon Giles Gardam (Oxford) Determining hyperbolic 3-manifold groups by their finite quotients 2:00 – 3:00pm Murray Elder (UTS) The structure of solutions to equations in free and virtually free groups Monday 10 July 2017 (Carslaw 375, The University of Sydney) Noon – 1 pm Becky Armstrong (The University of Sydney) Group actions, groupoids, and their $$C^{*}$$-algebras 3:00 – 4:00pm Huanhuan Li (Western Sydney University) Graded Steinberg algebras and their representations Wednesday 17 May 2017 (New Law School Annex SR 346, Carslaw 175, The University of Sydney) 10:00 – 11:00 am Ruth Corran (The American University of Paris) Garside monoids, and Garside structures on braid and reflection groups 1:00 – 2:00pm Kamil Bulinski (The University of Sydney) Diophantine patterns via non-random walks Tuesday 28 February 2017 (Carslaw 375, University of Sydney) Noon – 1:00 pm Stephan Tornier (ETH and Newcastle) p-localization of Burger-Mozes universal groups 3:00 – 4:00 pm Li Vas (University of the Sciences) Algebraization of Operator Theory Monday 31 October 2016 (Carslaw 373, University of Sydney) Noon – 1:00 pm Huanhuan Li (Western Sydney) The projective Leavitt complex 3:00 – 4:00 pm Anne Thomas (Sydney) Commensurability classification of certain Coxeter groups and amalgams of free groups Monday 5 September 2016 (Carslaw 350, Carslaw 175 , University of Sydney) Noon – 1:00 pm Anthony Dooley (UTS) The Kirillov orbit method, wrapping maps and $$e$$-functions 3:00 – 4:00 pm Michal Ferov (Newcastle) Amenable quotients of graph products of groups Monday 24 June 2013 (Carslaw 157, University of Sydney) Noon – 1:00 pm Pallavi Dani (Louisiana State) Filling invariants: homological vs. homotopical 3:00 – 4:00 pm Giles Gardam (Sydney) Graphs and triangles of groups Thursday 2 May 2013 (Carslaw 356, University of Sydney) 3:00 – 4:00 pm Sean Cleary (CCNY) The bizarre world of Thompson's groups Thursday 28 March 2013 (Carslaw 707A, University of Sydney) Noon – 1:00 pm Anne Thomas (Sydney) Lattices, polyhedral complexes and cubulations 3:00 – 4:00 pm Stefan Friedl (Cologne) The virtual fibering theorem for 3-manifolds Wednesday 27 February 2013 (AGR or Carslaw 451, University of Sydney) Noon – 1:00 pm José Burillo (Catalunya) Metric properties of Houghton's groups 3:00 – 4:00 pm Robert Tang (Warwick) Projections and hulls in the curve graph Wednesday 20 June 2012 (Carslaw 175, University of Sydney) Noon – 1:00 pm Stephan Tillmann (Sydney) Finite volume projective manifolds 3:00 – 4:00 pm Joseph Maher (CUNY Staten Island) Growth rates for stable commutator length Tuesday 22 May 2012 (Access Grid Room, Room 829, Carslaw Building, University of Sydney) Noon – 1:00 pm Arkadius Kalka (Queensland) Conjugacy in braid groups with applications in non-commutative and non-associative cryptography 3:00 – 4:00 pm Colin Reid (Louvain) Local Sylow theory of totally disconnected, locally compact groups Tuesday 3 April 2012 (Room 2.39, Building Y, Kingswood Campus, University of Western Sydney) Noon – 1:00 pm Volker Gebhardt (Western Sydney) Finite index subgroups of mapping class groups 2:30 – 3:30 pm Attila Egri-Nagy (Western Sydney) Recursive Reduction of Multiplication Tables Monday 20 February 2012 (Rooms 830 and 829, Carslaw Building, University of Sydney) Noon – 1:00 pm Derek Holt (Warwick) Automaticity of Artin groups 2:30 – 3:30 pm Anne Thomas (Sydney) Divergence in right-angled Coxeter groups Monday 12 September 2011 (Rooms 707A and 829, Carslaw Building, University of Sydney) Noon – 1:00 pm Donald Cartwright (Sydney) Enumerating the fake projective planes 3:00 – 4:00 pm Michael Cowling (UNSW) Powers of Random Matrices Monday 1 August 2011 (Rooms 707A and 829, Carslaw Building, University of Sydney) Noon – 1:00 pm Joel Louwsma (Caltech) Extremality of the rotation quasimorphism on the modular group 2:30 – 3:30 pm James Parkinson (Sydney) The Gindikin-Karpelevich formula Monday 6 June 2011 (Room 829, Carslaw Building, University of Sydney) Noon – 1:00 pm James East (Western Sydney) Idempotent generators in partition monoids 2:30 – 3:30 pm Pallavi Dani (Louisiana State) Higher Dehn functions of Bestvina-Brady groups Wednesday 11 May 2011 (Access Grid Room, University of Wollongong) 12:30 – 1:30 pm Jacqui Ramagge (Wollongong) Infinite groups, geometries and operator algebras 2:30 – 3:30 pm Anne Thomas (Sydney) Infinite generation of non-cocompact lattices on right-angled buildings Monday 14 March 2011 (Rooms 829 and 707A, Carslaw Building, University of Sydney) Noon – 1:00 pm Lawrence Reeves (Melbourne) Relatively hyperbolic groups 2:30 – 3:30 pm Jonathan Hillman (Sydney) Applications of $$L^2$$ methods to infinite groups Monday 14 Feb 2011 (Room V206, Mathematics Building, University of Newcastle) Noon – 1:00 pm George Willis (Newcastle) Rigidity of Homomorphisms from Arithmetic Groups to Totally Disconnected Groups 2:00 – 3:00 pm Adam Piggott (Bucknell) The automorphisms of McCullough-Miller space Monday 22 Nov 2010 (Room 707A, Carslaw Building, University of Sydney) Noon – 1:00 pm Michael Cowling (UNSW) Mappings preserving cosets of subgroups and the Fourier-Stieltjes algebra 2:30 – 3:00 pm Murray Elder (Newcastle) Sofic groups