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Vortragstätigkeit

► 2019

When	What / Where	Title of Talk
01/2019	Mini-Workshop on "Geometric Group Theory in Bonn" MPI für Mathematik, Bonn	Sofic approximations - what’s the problem (Keynote Speaker)

► 2018

When	What / Where	Title of Talk
11/2018	Mathematisches Kolloquium Universität Regensburg	Finitary approximations of groups and their applications
09/2018	Summer School on Logic and Algorithms in Group Theory Hausdorff Center for Mathematics Bonn	Stability and invariant random subgroups
08/2018	ICM 2018 - International Congress of Mathematicians Rio de Janeiro	Finitary approximations of groups and their applications (Invited Talk - Section Topology)
07/2018	K-theory School Universidad Nacional de La Plata, Argentina	Course: Algebraic K-theory for rings of functional analytic type
06/2018	International Conference on Manifolds, Groups and Homotopy Isle of Skye, Scotland	Topological methods to solve equations over groups
04/2018	"Arithmetic and Analysis" A conference on the occasion of Christopher Deninger's 60th birthday WWU Münster	Stability, cohomology vanishing, and non-approximable groups

► 2017

When	What / Where		Title of talk
11/2017	Action Now Wandering Seminar! Ben Gurion University, Israel		Stability of asymptotic representations, cohomology vanishing, and non-approximable groups
11/2017	Colloquium Hebrew University, Jerusalem, Israel		Topological methods to solve equations over groups
11/2017	Midrasha Weizmann Institute Rehovot, Israel		Laws for finite groups
11/2017	Lecture Course “High-dimensional Expanders” IIAS, Jerusalem, Israel		C*-algebras and group theory
11/2017	Seminar Algebra Innsbruck, Austria		Short laws for finite groups
10/2017	RTG Colloquium Karlsruhe, Germany		Stability of asymptotic representations, cohomology vanishing, and non-approximable groups
09/2017	Workshop on Operator Algebras, Geometry, and Actions Warsaw, Poland		Stability of asymptotic representations, cohomology vanishing, and non-approximable groups
08/2017	Sums of Squares - Real Algebraic Geometry and its Applications Innsbruck, Austria		Positive definite functions with symmetry
07/2017	Von Neumann algebras and measured group theory IHP, Paris, France		Groups of finite type
06/2017	Summer School on K-Theory and Related Fields, Bonn, Germany		Algebraic vs. topological K-theory
06/2017	Groups, Manifolds and K-theory Münster, Germany		The algebraic theory of L2-invariants
05/2017	Workshop “Approximation, deformation, quasification” Cambridge, UK		On finitarily approximable groups
03/2017	Séminaire d’Algèbres d’Opérateurs, Paris, France		L2-Betti numbers of totally disconnected groups and their approximation by Betti numbers of lattices
01/2017	Kolloquium, TU Darmstadt, Germany		Topological methods to solve equations over groups

► 2016

When	What / Where		Title of talk
11/2016	Seminar Algebra (invited by Tim Netzer)		Topological methods to solve equations over groups
10/2016	Seminar Non-linear algebra MPI-MIS Leipzig, Germany (invited by Bernd Sturmfels)		Topological methods to solve equations over groups
07/2016	XXI Coloquio Latinoamericano de Álgebra Buenos Aires, Argentina		Topological methods to solve equations over groups
06/2016	Symposium: The mathematical legacy of Uffe Haagerup Copenhagen, Denmark		Groups of finite type
06/2016	Polish groups and geometry Paris 7, Paris, France		Groups of finite type
01/2016	Workshop Model Theory: groups, geometry, and combinatorics Oberwolfach, Germany		Laws for finite groups

► 2015

When	What / Where		Title of talk
11/2015	Scottish Operator Algebras Research meeting Glasgow, Scotland		1) Bounded normal generation and automatic invariant continuity 2) Quasi-isometry and topological orbit equivalence of groups
10/2015	Arbeitsgemeinschaft: Mathematical Quasicrystals Oberwolfach, Germany		Danzer' Problem and topological dynamics
08/2015	Conference on Topology and Geometry Bonn, Germany		Topological methods to solve equations over groups
06/2015	Workshop "Non-commutative Geometry" Oberwolfach, Germany		Non-commutative Real Algebraic Geometry
06/2015	Hausdorff Kolloquium Bonn, Germany		Determinants, Entropy, and L²-Torsion
06/2015	Growth, Symbolic Dynamics and Combinatorics of Words in Groups Paris, France		Asymptotic properties of word maps on compact simple groups
05/2015	Workshop on NonLinear Algebra Berlin, Germany		Hilbert's 17th Problem
05/2015	NCGOA Spring Institute 2015 Nashville, USA		Bounded normal generation and invariant automatic continuity
05/2015	NCGOA Spring Institute 2015 Nashville, USA		Lecture Series: Finite-dimensional approximation properties of groups and their applications
04/2015	Asymptotic invariants of groups Oxford, England		Approximation theorems for totally disconnected groups
03/2015	Spring school on Algebraic K-theory of topological algebras Regensburg, Germany		Lecture Series: Algebraic vs. topological K-theory
02/2015	Generalized Cohomology Sde Boker, Israel		Lecture Series: L2-cohomology for locally compact groups
01/2015	Workshop "Geometric Topology" Oberwolfach, Germany		Divisibility and group laws for finite simple groups

► 2014

When	What / Where		Title of talk
12/2014	Gruppen, Geometrie und Dynamik Gießen, Germany		Divisibility and group laws for finite simple groups
11/2014	Colloquium; invited by Dieter Kotschick LMU München, Germany		Divisibility and group laws for finite simple groups
10/2014	Arbeitsgemeinschaft: Totally Disconnected Groups Oberwolfach, Germany		Transformation groups
09/2014	Invited lecture series ICMAT; Madrid, Spain		Lecture Series: Finite-dimensional approximation properties of groups and their applications
09/2014	Workshop "Topologie" Oberwolfach, Germany		Equations over groups
07/2014	Operator Theory 25 Timisoara, Romania		Random walks and random invariant forests
06/2014	Workshop on Graphs, Groups, and Probability Renyi Institute, Budapest, Hungary		Divisibility and group laws for finite simple groups
06/2014	Summer School on Graphs, Groups, and Probability Renyi Institute, Budapest, Hungary		Lecture Series: Graph limits and applications to groups and group rings
04/2014	Workshop Real Algebraic Geometry With A View Toward Systems Control and Free Positivity Oberwolfach, Germany		NC real algebraic geometry and applications to group rings
04/2014	Arbeitsgemeinschaft: Superrigidity Oberwolfach, Germany		NC real algebraic geometry and applications to group rings
02/2014	Groups acting on rooted trees and around (Conference as part of the IHP trimester on Random Walks and Asymptotic Geometry of Groups) IHP, Paris, France		Random walks and invariant random forests
02/2014	Séminaire Algèbres d'opérateurs Jussieu-PRG, Paris, France		Determinants, Entropy, and l²-Torsion
01/2014	Algebra Seminar Glasgow, Scotland		Equations over groups
01/2014	Analysis Seminar Glasgow, Scotland		Determinants, Entropy, and l²-Torsion

► 2013

When	What / Where		Title of talk
12/2013	Oberseminar Analysis, invited by Elmar Schrohe Hannover, Germany		Determinants and Entropy
12/2013	Colloquium, invited by Bernhard KrötzPaderborn, Germany		Determinants and Entropy
11/2013	NRW Topologie Tagung Bonn, Germany		Entropy, Determinants, and L2-Torsion
10/2013	Arbeitsgemeinschaft: Sofic Entropy Oberwolfach, Germany		Sofic groups
08/2013	Workshop "C*-Algebren" Oberwolfach, Germany		Ultraproducts of compact simple groups
08/2013	Concentration week in Dynamics, Geometry, and Operator Algebras Texas A&M, USA		Character rigidity and its consequences
07/2013	Dynamical systems of algebraic origin Seattle, USA		von Neumann algebras, Determinants, and l2-Torsion
07/2013	Von Neumann algebras and measurable group theory Leuven, Belgium		Determinants, Entropy, and l2-Torsion
06/2013	Noncommutative Geometry and Quantum Groups at the Fields Institute Toronto, Canada		Determinants, Entropy, and l2-Torsion
06/2013	Colloquium, invited by Martin Henk Magdeburg, Germany		Groups and their characters
05/2013	Geometrie-Seminar, invited by Ulrich Brehm Dresden, Germany		Was ist der Limes einer Folge von Graphen?
04/2013	Word maps and stability of representations ESI, Vienna, Austria		Ulam stability and character rigidity
04/2013	Arbeitsgemeinschaft: Limits of Structures Oberwolfach, Germany		Sofic groups and unimodular random networks

► 2012

When	What / Where		Title of talk
11/2012	Masterclass on Sofic groups and applications to operator algebras Copenhagen, Denmark		Lecture Series: Finite-dimensional approximation properties of groups and their applications
10/2012	Action Now, group actions, their dynamics and geometry Berlin, Germany		Determinants, Entropy, and l2-Torsion
08/2012	Golod-Shafarevich Groups and Algebras and Rank Gradient ESI, Vienna, Austria		Normal generation of groups and l²-invariants
07/2012	Colloquium of the RTG "Mathematical structures in Quantum Physics" Göttingen, Germany		Determinants, Entropy, and l2-Torsion
05/2012	Colloquium, invited by Ulrich BrehmDresden, Germany		Determinants and Entropy
04/2012	Geometric and Analytic Aspects of Group TheoryInstitut Mittag-Leffler, Stockholm, Sweden		Determinants, Entropy, and l2-Torsion
03/2012	Dynamics Seminar, invited by Alex Lubotzky and Elon Lindenstrauss Jerusalem, Israel		Determinants, Entropy, and l2-Torsion
02/2012	Invariant random subgroups Sde Boker, Israel		Determinants, Entropy, and l2-Torsion
02/2012	Positivity, Convexity, NC-Geometry, Optimization Magdeburg, Germany		Determinants, Entropy, and l2-Torsion

► 2011

When	What / Where		Title of talk
12/2011	Infinite monster groups ESI, Vienna, Austria		1) von Neumann algebras and l2-invariants 2) Determinants, Entropy, and l2-Torsion
12/2011	Sächsischer Geometrietag Chemnitz, Germany		Hilberts 17th problem and its descendants
11/2011	Talk at the Institute of Mathematics Münster, Germany		Determinants, Entropy, and l2-Torsion
11/2011	Colloquium Regensburg, Germany		Determinants, Entropy, and l2-Torsion
11/2011	Noncommutative Geometry Seminar of the Mathematical Institute of the Polish Academy of Sciences Warsaw, Poland		1) Convergent sequences in discrete groups 2) Algebraic Geometry of topological spaces
11/2011	Workshop on the occasion of Eberhard Kirchberg's 65th birthday Copenhagen, Denmark		Determinants, Entropy, and l²-Torsion
09/2011	DMV Tagung Köln, Germany		l2-Betti numbers for groups and manifolds
09/2011	AIM Workshop: L2 invariants and their relatives for finitely generated groups AIM, Palo Alto, California		l2-invariants and their approximation properties
09/2011	Conference on C*-algebras and related topics RIMS, Kyoto, Japan		l2-invariants for groups and groupoids
07/2011	Workshop "Von Neumann algebras and ergodic theory of group actions" IHP, Paris, France		l2-Betti numbers for groups and groupoids and their applications
06/2011	Semester "Von Neumann algebras and ergodic theory of group actions" IHP, Paris, France		Lecture series: Finite-dimensional approximation properties of groups and their applications
05/2011	Workshop "Finite-dimensional Approximation of Discrete Groups" Oberwolfach, Germany		Introduction to sofic and hyperlinear groups and applications
05/2011	Talk at the Dept. of Mathematics TU Dresden, Germany		Gruppen und Geometrie
04/2011	Non-commutative geometry Seminar, Subfactor Seminar, and Topology and Group Theory seminar Vanderbilt, Nashville, USA		Finite-dimensional approximation properties of groups
03/2011	Invited by David Fisher and Russell Lyons as Visiting Scholar of the Department of Mathematics Bloomington, Indiana, USA		Finite-dimensional approximation properties of groups
03/2011	Group actions on measure spaces TAMU College Station, USA		Extensions of discrete measured groupoids

► 2010

When	What / Where		Title of talk
12/2010	6. Thüringer Geometrietag Jena, Germany		Betti numbers of finite covers of compact 3-manifolds
11/2010	Kolloquium über Reine Mathematik Hamburg, Germany		Convergent sequences in discrete groups
11/2010	Invited Speaker at North British Functional Analysis Seminar Glasgow, Scotland		Lecture series: Unitary representations of groups - variations on a theme
11/2010	Conference "K-theory, C*-algebras and index theory" Göttingen, Germany		Homotopy invariance of negative algebraic K-theory
09/2010	Workshop "Topologie" Oberwolfach, Germany		Homotopy invariance of negative algebraic K-theory
09/2010	Workshop "Actions and Invariants of Residually Finite Groups: Asymptotic Methods" Oberwolfach, Germany		Integrality properties of spectral measures
09/2010	NestFest - Conference in Honor of Ryszard Nest's 60th Birthday Copenhagen, Denmark		Convergent sequences in discrete groups
08/2010	Talk at the Mathematical Institute Göttingen, Germany		Convergent sequences in discrete groups
06/2010	Noncommutative Lp-spaces, Operator spaces and ApplicationsBanff, Canada		Finite-dimensional approximation properties of groups and tracial algebras
06/2010	Summer school on C*-algebrasNordfjordeid, Norway		Lecture series: Unitary representations of groups
05/2010	Talk in the Oberseminar Geometrie, MPI MISLeipzig, Germany		Convergent sequences in discrete groups
03/2010	Talk in the Geometry Seminar ETH Zürich, Switzerland		Stability of unitary representations
03/2010	Workshop "C*-Algebren" Oberwolfach, Germany		Stability of unitary representations
02/2010	Visit of the Alfred Renyi Institute of the Hungarian Academy of Sciences Budapest, Hungary		Cocycles and l2-invariants
02/2010	Workshop about von Neumann algebras and group actions Copenhagen, Denmark		Lecture series: Stability of unitary representations
01/2010	Colloquium of the Mathematical Institute Münster, Germany		Almost representations of lattices in semi-simple Lie groups
01/2010	Talk at the Dept. of MathematicsTU Dresden, Germany		Eine parametrisierte Version des Satzes von Quillen-Suslin

► 2009

When	What / Where		Title of talk
11/2009	HIM Trimester Program on Rigidity Bonn, Germany		Almost representations of lattices in semi-simple Lie groups
11/2009	Colloquium of the RTGGöttingen, Germany		Almost representations of lattices in semi-simple Lie groups
09/2009	HIM Trimester Program on Rigidity Bonn, Germany
09/2009	Workshop "Noncommutative Geometry" Oberwolfach, Germany		Algebraic K-theory and algebraic approximation
06/2009	Affine Isometric Actions of Discrete Groups Ascona, Switzerland		Group Cocycles and the ring of affiliated operators
04/2009	Invited lecture series at the School about Non-commutative Geometry Tehran, Iran		Lecture Series: Discrete groups, von Neumann algebras and Non-commutative Geometry
04/2009	Geometric Group Theory on the Gulf Coast South Padre Island, Texas		Hyperlinear groups without the factorization property
03/2009	Talk at Séminaire de Géométrie et Théorie Ergodique EPFL, Switzerland		Hyperlinear groups without factorization property
03/2009	Talk at the DPG meetingMunich, Germany		Homological properties of quantum groups
02/2009	Seminar Algebres d'Operateurs Paris, France		Hyperlinear groups without factorization property

► 2008

When	What / Where		Title of talk
11/2008	Operator algebraic aspects of quantum groups Leuven, Belgium		Homological properties of the orthogonal quantum group A_o(n)
10/2008	Workshop "Von Neumann Algebras and Ergodic Theory of Group Actions" Oberwolfach, Germany		Hyperlinear groups without factorization property
09/2008	Workshop on the occasion of Joachim Cuntz' sixtieth birthday Münster, Germany		Hyperlinear groups without factorization property
09/2008	Workshop "Topologie" Oberwolfach, Germany		Group Cocycles and the ring of affiliated operators
08/2008	Workshop "C*-Algebras" Oberwolfach, Germany		L2-invariants and simplicity of group C*-algebras
07/2008	Talk at the Institute of Mathematics Leipzig, Germany		Analytische Invarianten im Studium unendlicher Gruppen
05/2008	Percolation on transitive Graphs AIM Palo Alto, California
05/2008	Talk at the Dept. of Mathematics Bielefeld, Germany		L2-Invarianten und deren Anwendungen in der geometrischen Gruppentheorie
04/2008	Ninth NRW Topology Meeting Münster, Germany		Group cocycles and the subgroup structure of negatively curved groups
03/2008	Algebra Seminar, invited by Ulrich Krähmer, Glasgow, Scotland		Group cocycles and the subgroup structure of negatively curved groups
02/2008	Workshop on non-commutative geometry Copenhagen, Denmark		Group cocycles and the subgroup structure of negatively curved groups
02/2008	Journées ''Groupes quantiques'' Strasbourg, France		L2-invariants for groups and quantum groups
02/2008	Talk at the Dept. of Mathematics Regensburg, Germany		Über die algebraische Eigenwertvermutung
01/2008	21. Workshop "Foundations and Constructive Aspects of QFT" Göttingen, Germany		Open problems in the theory of von Neumann algebras and their relation to physics

► 2007

When	What / Where		Title of talk
11/2007	Invited by Bernhard Hanke and Dieter Kotschick, Oberseminar GeometrieLMU München, Germany		Group cocycles and the subgroup structure of negatively curved groups
10/2007	Invited by Ulrich Bunke	Regensburg, Germany	Gruppen-Kozykel und der Ring der affilierten Operatoren
10/2007	Workshop on von Neumann algebras, Fields Institute	Toronto, Canada	Group Cocycles and the ring of affiliated operators
09/2007	Workshop "Noncommutative Geometry"	Oberwolfach, Germany	Group Cocycles and the ring of affiliated operators
08/2007	Invited lecture series at the International School on non-commutative Geometry	Chern Institute, Tianjin, China	L2-Betti numbers and von Neumann algebras
06/2007	Talk at the Born-Hilbert-Seminar	Göttingen, Germany	Spectral properties of discrete Laplacians
06/2007	Talk at the Joint International Meeting UMI-DMV	Perugia, Italy	Rank metric completion and L²-invariants
06/2007	Conference Free Probabilities, Operator Spaces and von Neumann Algebras	IMAR, Sibiu, Romania	Sofic groups and diophantine approximation
04/2007	2 talks at the Fachbereich Mathematik und Informatik	Münster, Germany	1) Über die algebraische Eigenwert Vermutung 2) Homotopy invariance in algebraic K-theory
04/2007	Invited by Yuri Tschinkel, Seminar about Algebraic and Arithmetic Geometry	IU Bremen, Germany	Sofic groups and diophantine approximation
03/2007	Free probability and the large N limit	Berkeley, USA	Rank metric completion and L2-invariants
03/2007	Invited by Benoit Collins, Ottawa-Carleton Analysis Seminar	Ottawa, Canada	Sofic groups and diophantine approximation
02/2007	Invited by Ryszard Nest	Copenhagen, Denmark	Sofic groups and diophantine approximation
01/2007	Invited by Paul Balmer	ETH Zürich, Switzerland	Sofic groups and diophantine approximation

► 2006

When	What / Where		Title of talk
10/2006	ECOAS 06 Georgia Tech, Atlanta, USA		L2-invariants and rank metric
09/2006	Invited lecture series Vanderbilt Univ., USA		Lecture series: L2-invariants for groups and von Neumann algebras
09/2006	VASBI, Satellite conference of the ICM 2006 about non-commutative Geometry Valladolid, Spain		Comparison between algebraic and topological K-theory
06/2006	AIM Workshop about Free Analysis AIM Palo Alto, California, USA		L2 -cohomology for von Neumann algebras
05/2006	Invited by C.-F. Bödigheimer Bonn, Germany		L2 -cohomology for von Neumann algebras
05/2006	Invited by Wolfgang Lück and Arthur Bartels Münster, Germany		L2 -cohomology for von Neumann algebras
04/2006	Workshop Non-commutative Geometry BIRS Banff, Canada		L2 -cohomology for von Neumann algebras
04/2006	Invited by Ken Dykema TAMU College Station, USA		L2 -cohomology for von Neumann algebras
01/2006	Elliptic theory and C*-algebras MRCC Bedlewo, Poland		Homotopy invariance in algebraic K-theory

► 2005

When	What / Where		Title of talk
09/2005	Workshop "C*-Algebren" Oberwolfach, Germany		L2-cohomology for von Neumann algebras
05/2005	Invited by Thomas Schick Göttingen, Germany		L2-cohomology for von Neumann algebras

► 2004

When	What Where/		Title of talk
12/2004	Invited by Guillermo Cortinas Valladolid, Spain		Homotopy invariance in algebraic K-theory
11/2004	Quantum Spaces - Noncommutative Geometry Dublin, Ireland		Algebraic K-theory of locally convex algebras
05/-07/2004	Semestre about non-commutative Geometry and algebraic K-theory IHP Paris, France		About the image of the Baum-Connes assembly map
05/2004	Seminar Algebres d'Operateurs Paris, France		Unstable homology theories and beyond Bott periodicity

► 2003

When	WhatWhere		Title of talk
07/2003	Operator algebras Sinaia, Romania		Bivariant homology and connective E-theory
05/2003	Invited by Michael Puschnigg CIRM Luminy, France		Bivariant homology and connective E-theory
03/2003	Workshop Non-commutative Geometry BIRS Banff, Canada		Bivariant homology and connective E-theory

► 2001

When	What / Where		Title of talk
12/2001	Workshop "C*-Algebren Oberwolfach, Germany		Bivariant homology and connective E-theory

Helga Mettke

Letzte Änderung: 08.03.2019