Wilhelm Killing, 1847-1923
© ULB Münster

Colloquium Wilhelm Killing

The colloquium is named after Wilhelm Killing, who was a distinguished professor of the Department from 1892 to 1919.

According to Hans-Joachim Nastold und Otto Forster: Die Mathematik an der Universität Münster. In: Die Universität Münster 1780 – 1980 (Hrsg. Heinz Dollinger), S. 429 – 432, Aschendorff,Münster 1980:

Killings main interests were the foundations of geometry, of non-euclidean spaces and - in today's terminology - the classification of simple Lie Algebras.

Killing contributed critical parts to the classifcation of semi-simple Lie Algebras, which was later completed by E. Cartan. It is a theory that has a tremendous significance for various areas in Mathematics and Physics.

Please find remarks about the history of the department here (in German).


Time, Place: Thursdays 14:15 to 15:15, weekly, as hybrid event in person and/or via ZOOM, virtual tea time starts at 15:30, if not announced otherwise


Neue Veranstaltung eingeben

Current Talks

Date Speaker InstitutionTitle
12.10.2023Wilhelm Killing Kolloquium: Dr. Riccardo Christoferi Radboud University TBA
26.10.2023Wilhelm Killing Kolloquium: Prof. Dr. Bernhard Hanke Universität Augsburg TBA
02.11.2023Wilhelm Killing Kolloquium: Prof. Dr. William Crawley-Boevey Universität Bielefeld TBA
09.11.2023Wilhelm Killing Kolloquium: Postdocs of Mathematics Münster WWU Münster Scientific postdoc presentations
16.11.2023Wilhelm Killing Kolloquium: Prof. Dr. Tobias Weth Universität Frankfurt TBA
11.01.2024Wilhelm Killing Kolloquium: Prof. Dr. Anne Pichon Aix Marseille University TBA
18.01.2024Wilhelm Killing Kolloquium: Prof. Dr. Ruppert Klein Freie Universität Berlin TBA

Past Talks

Date Speaker InstitutionTitle
13.07.2023Wilhelm Killing Kolloquium: Prof. Dr. Catharina Stroppel Universität Bonn From Platonic solids to Springer theory and beyond
29.06.2023Wilhelm Killing Kolloquium: Prof. Dr. Peter Topping University of Warwick PDE aspects of geometric flows
22.06.2023Wilhelm Killing Kolloquium: Dr Rajula Srivastava Universität Bonn Counting Rational Points near Flat Hypersurfaces
15.06.2023Wilhelm Killing Kolloquium: Prof. Dr. David Broadhurst Open University, UK Taming unsummable series
07.06.2023Wilhelm Killing Kolloquium: Prof. Dr. Björn Bringmann Princeton Probabilistic aspects of scalar and geometric wave equations
25.05.2023ABGESAGT Wilhelm Killing Kolloquium: Prof. Dr. Vincent Vargas University of Geneva Modular bootstrap, Segal's axioms and resolution of Liouville conformal field theory
11.05.2023Wilhelm Killing Kolloquium: Prof. Dr. Daniel Huybrechts Universität Bonn The K3 category of a cubic fourfold
04.05.2023CRC Colloquium:
Prof. Dr. Gustav Holzegel
WWU Münster Geometric non-linear wave equations.
Dr. Christopher Kauffman (WWU Münster): Perturbed wave equations on black hole spacetimes.

27.04.2023Lecture in memoriam W. Scharlau: Prof. Dr. Jean-Pierre Tignol UCLouvain Linkage of quaternion algebras and systems of quadratic equations over number fields (Wilhelm Killing Kolloquium)
20.04.2023Wilhelm Killing Kolloquium: Prof. Dr. Jean-Christophe Mourrat École normale supérieure de Lyon Mean-field disordered systems and Hamilton-Jacobi equations
13.04.2023Wilhelm Killing Kolloquium: Postdocs of Mathematics Münster WWU Münster Scientific postdoc presentations
19.01.2023Wilhelm Killing Kolloquium: Prof. Dr. Thomas Scanlon University of California, Berkeley Likely Intersections
08.12.2022Wilhelm Killing Kolloquium: Prof. Dr. Roland Bauerschmidt University of Cambridge What is Quantum Field Theory?
01.12.2022Wilhelm Killing Kolloquium: Prof. Dr. Franck Sueur Université de Bordeaux Is there a chance to control the climate?
24.11.2022Wilhelm Killing Kolloquium: Prof. Dr. Alain Trouvé Ecole Normale Superieure, Paris-Saclay Diffeomorphic transport, Riemannian geometry, geometric information and scales
17.11.2022Wilhelm Killing Kolloquium: Prof. Dr. Timo Richarz TU Darmstadt Reductions of Shimura varieties
10.11.2022Wilhelm Killing Kolloquium: Prof. Dr. Felix Schulze University of Warwick Compactness of 3-dimensional Ricci-pinched manifolds
03.11.2022Wilhelm Killing Kolloquium: Prof. Dr. Andrea Malchiodi Scuola Normale Superiore Pisa A Variational approach to Liouville equations
27.10.2022Postdocs of Mathematics Münster WWU Münster Scientific postdoc presentations
13.10.2022Wilhelm Killing Kolloquium: Dr. Serhii Bardyla Universität Wien Algebra, Topology and Completeness
14.07.2022SFB-Kolloquium: 1. Vortrag: Geodesics on the space of Kähler Metrics Bianca Santoro 1. Vortrag: Geodesics on the space of Kähler Metrics (Bianca Santoro); 2. Vortrag: Ricci Curvature, Scalar Curvature and Regularity Theory (Hans-Joachim Hein)
07.07.2022Wilhelm Killing Kolloquium: Prof. Dr. Jochen Koenigsmann University of Oxford Prof. Dr. Jochen Koenigsmann (University of Oxford) in person: Encoding arithmetic in Galois groups
30.06.2022Wilhelm Killing Kolloquium: Prof. Dr. Menachem Magidor Einstein Institute of Mathematics Prof. Dr. Menachem Magidor (Einstein Institute of Mathematics) in person: Regularity properties of subsets of the real line and other polish spaces
23.06.2022Wilhelm Killing Kolloquium: Prof. Dr. Michael Aizenman Princeton University Prof. Dr. Michael Aizenman (Princeton University) in person: Random loop ensembles as a common mathematical scaffolding of some quantum and classical stat mech models
15.06.2022Wilhelm Killing Kolloquium: Postdocs of Mathematics Münster WWU Münster Postdocs of Mathematics Münster (WWU Münster) in person and via Zoom: Scientific postdoc presentations
02.06.2022Wilhelm Killing Kolloquium: Prof. Dr. Guido Kings Universität Regensburg Prof. Dr. Guido Kings (Universität Regensburg) in person and via Zoom and YouTube: Introduction to the Birch-Swinnerton-Dyer conjecture
19.05.2022Wilhelm Killing Kolloquium Retreat Cluster
12.05.2022Wilhelm Killing Kolloquium: Prof. Dr. Bruno Klingler Humboldt Universität zu Berlin Prof. Dr. Bruno Klingler (Humboldt Universität zu Berlin) in person and via zoom: Tame geometry and Hodge theory
05.05.2022Wilhelm Killing Kolloquium: Prof. Dr. Ben Schweizer TU Dortmund Prof. Dr. Ben Schweizer (TU Dortmund) in person and via zoom: On the long time behavior of waves
28.04.2022Wilhelm Killing Kolloquium: Prof. Dr. Stefan Steinerberger University of Washington Prof. Dr. Stefan Steinerberger (University of Washington) via ZOOM: The Notion of Curvature on Graphs
21.04.2022Wilhelm Killing Kolloquium: Prof. Dr. Rustum Choksi McGill University Prof. Dr. Rustum Choksi (McGill University) in person and via zoom: Three Variational Problems Addressing Three Physical Paradigms
14.04.2022Wilhelm Killing Kolloquium es findet am 14. April 2022 kein Vortrag statt
07.04.2022Wilhelm Killing Kolloquium: Prof. Dr. Alan Reid Rice University Prof. Dr. Alan Reid (Rice University) in person: Profinite rigidity, direct products and finite presentability
03.02.2022CRC Colloquium:
Prof. Dr. Wilhelm Winter
WWU Münster Approximation properties and rigidity questions for C*-algebras
Prof. Dr. David Kerr (WWU Münster): The dynamics of comparison

The talks will take place as hybrid event.

27.01.2022Wilhelm Killing Kolloquium es findet am 27. Januar kein Vortrag statt
20.01.2022Wilhelm Killing Kolloquium es findet am 20. Januar kein Vortrag statt
13.01.2022Wilhelm Killing Kolloquium: Prof. Dr. Robert Pego Carnegie Mellon University Prof. Dr. Robert Pego (Carnegie Mellon University) via ZOOM: Stable communities in Lotka-Volterra dynamics: exclusion, multiplicity, stabilization
09.12.2021Wilhelm Killing Kolloquium: Prof. Dr. Guido Montúfar University of California, Los Angeles Prof. Dr. Guido Montúfar (University of California, Los Angeles) via ZOOM: Geometry of Linear Convolutional Networks
02.12.2021Wilhelm Killing Kolloquium: Postdocs of Mathematics Münster WWU Münster Postdocs of Mathematics Münster (WWU Münster) via Zoom: Scientific postdoc presentations
25.11.2021Wilhelm Killing Kolloquium: Prof. Dr. Daniel Peterseim Universität Augsburg Prof. Dr. Daniel Peterseim (Universität Augsburg) in person: Hybrid event: On the localization problem in numerical homogenization
18.11.2021Wilhelm Killing Kolloquium: Prof. Dr. Robert Kohn New York University Prof. Dr. Robert Kohn (New York University) via ZOOM: Mechanical Metamaterials
11.11.2021Wilhelm Killing Kolloquium: Prof. Dr. Mohammed Abouzaid Columbia University Prof. Dr. Mohammed Abouzaid (Columbia University) via ZOOM: Homotopical methods in Floer theory
04.11.2021Wilhelm Killing Kolloquium: Prof. Dr. André Neves University of Chicago Prof. Dr. André Neves (University of Chicago) via ZOOM: Minimal surfaces in hyperbolic manifolds
28.10.2021Wilhelm Killing Kolloquium: Prof. Dr. Filip Rindler University of Warwick Prof. Dr. Filip Rindler (University of Warwick) in person: Hybrid event: Elasto-plasticity driven by dislocation movement
21.10.2021Wilhelm Killing Kolloquium es findet am 21. Oktober kein Vortrag statt
14.10.2021Wilhelm Killing Kolloquium: Prof. Dr. Nadia S. Larsen University of Oslo Prof. Dr. Nadia S. Larsen (University of Oslo) in person: Hybrid event: Higher rank graphs: a C*-algebraic perspective and beyond
15.07.2021CRC Colloquium:
Prof. Dr. Arthur Bartels
WWU Münster K-theory everywhere
Prof. Dr. Thomas Nikolaus (WWU Münster): Relation to arithmetic cohomology theories

The talks will take place as hybrid event.

08.07.2021Wilhelm Killing Kolloquium: Prof. Dr. Xin Li University of Glasgow per ZOOM: Interactions between C*-algebras, topological dynamics and group theory
01.07.2021Wilhelm Killing Kolloquium: Prof. Dr. Bernold Fiedler Freie Universität Berlin per ZOOM: On meanders
24.06.2021Wilhelm Killing Kolloquium: Prof. Dr. Michael Jeffrey Ward University of British Columbia per ZOOM: Topics in Localized Pattern Formation for Reaction-Diffusion Systems in 3-D
17.06.2021Wilhelm Killing Kolloquium: Prof. Dr. Artem Chernikov University of California/Los Angeles per ZOOM: Recognizing groups and fields in Erd?s geometry and model theory
10.06.2021Wilhelm Killing Kolloquium: Prof. Dr. Yilin Wang Massachusets Institut of Technology per ZOOM: How round is a Jordan curve?
20.05.2021Wilhelm Killing Kolloquium: Prof. Dr. Chris Wendl Humboldt Universität Berlin On transversality and symmetry per ZOOM:
06.05.2021Wilhelm Killing Kolloquium: Prof. Dr. Annalisa Massaccesi Università Degli Studi Di Padova per ZOOM: Multi-material transport problems
29.04.2021Wilhelm Killing Kolloquium: Prof. Dr. Roman Sauer Universität Karlsruhe per ZOOM: Actions on Cantor spaces, volume and macroscopic scalar curvature
22.04.2021Wilhelm Killing Kolloquium: Prof. Dr. Henry Wilton University of Cambridge per ZOOM: Negative immersions and one-relator groups
15.04.2021Wilhelm Killing Kolloquium: Prof. Dr. Joel Fine Université Libre de Bruxelles per ZOOM: Knots and minimal surfaces
04.02.2021Wilhelm Killing Kolloquium: Prof. Dr. Eva Viehmann TU München per ZOOM: Frobenius-conjugacy classes and affine Deligne-Lusztig varieties
28.01.2021Wilhelm Killing Kolloquium: Prof. Dr. Clara Löh Universität Regensburg per ZOOM: Computing simplicial volumes
21.01.2021Wilhelm Killing Kolloquium: Prof. Dr. Ruth Charney Brandeis University per ZOOM: Searching for Hyperbolicity
14.01.2021Wilhelm Killing Kolloquium: Prof. Dr. Carolyn S. Gordon Dartmouth College per ZOOM: Can you hear the shape of a manifold?
10.12.2020Wilhelm Killing Kolloquium: Prof. Dr. Ilaria Perugia Universität Wien per ZOOM: Problem-oriented finite elements
03.12.2020Wilhelm Killing Kolloquium: Prof. Dr. Leif Döring Universität Mannheim per ZOOM: On individualization Strategies in university education in mathematics
26.11.2020Wilhelm Killing Kolloquium: Prof. Dr. Gilles Francfort Université Paris XIII Plasticity, a template for dissipation in solids
19.11.2020Wilhelm Killing Kolloquium: Prof. Dr. Nicolas Perkowski FU Berlin per ZOOM: Infinite regularization by noise
12.11.2020Wilhelm Killing Kolloquium: Prof. Dr. Jacob Bedrossian University of Maryland per ZOOM: Almost-sure exponential mixing for stochastic Navier-Stokes with applications to passive scalar turbulence
16.07.2020Wilhelm Killing Kolloquium - Prof. Dr. Hannah Markwig Tübingen per ZOOM: Curve counting and tropical geometry
09.07.2020Wilhelm Killing Kolloquium: Prof. Dr. Nicolas Perkowski FU Berlin Dieser Vortrag fällt aus!
18.06.2020Wilhelm Killing Kolloquium: Prof. Dr. Wolfgang Lück Bonn Prof. Dr. Wolfgang Lück (Bonn) "Groups meet C*-algebras, an appetizer" https://wwu.zoom.us/j/91691193801
10.06.2020Wilhelm Killing Kolloquium: Prof. Dr. Gianluigi Rozza SISSA Prof. Dr. Gianluigi Rozza (SISSA) State of the art and perspectives for reduced order methods in computational fluid dynamics https://wwu.zoom.us/j/94121190906
20.05.2020Wilhelm Killing Kolloquium: Prof. Dr. Benjamin Klopsch Düsseldorf Prof. Dr. Benjamin Klopsch (Düsseldorf) - Der Vortrag fällt aus!
14.05.202017. John von Neumann Lecture: Prof. Dr. Anna Erschler CNRS and ENS Paris Der Vortrag fällt aus!
07.05.2020Wilhelm Killing Kolloquium: Prof. Dr. Nicolas Perkowski TU Berlin Prof. Dr. Nicolas Perkowski (TU Berlin) - Der Vortrag wird auf den 9. Juli 2020 verschoben!
16.04.2020Wilhelm Killing Kolloquium: Dr. Filip Rindler Warwick Singularities in measures - Der Vortrag fällt aus!
30.01.2020Kolloquium Wilhelm Killing: Prof. Dr. Assaf Rinot Bar-Ilan Hindman's theorem and uncountable Abelian groups
23.01.2020Kolloquium Wilhelm Killing: Dr. Dawid Kielak Bielefeld Three-manifolds, Thurston's insights and a little algebra
16.01.2020Kolloquium Wilhelm Killing: Prof. Dr. Roberto Longo Rom The information in a wave
08.01.2020Kolloquium Wilhelm Killing: Prof. Dr. Gerhard Huisken Tübingen Deforming hypersurfaces with geometric heat equations and surgery
19.12.2019Friedrich-Hirzebruch-Kolloquium: Prof. Dr. Christian Bär Universität Potsdam Counterintuitive approximations
12.12.2019Kolloquium Wilhelm Killing: Dr. José Luis Romero Wien Sampling and time-frequency analysis
05.12.2019Kolloquium Wilhelm Killing: Prof. Dr. Nicola Gigli SISSA Trieste Functional analysis and metric geometry
28.11.2019Kolloquium Wilhelm Killing: Prof. Dr. Michael Röckner Bielefeld Nonlinear Fokker-Planck equations and distribution dependent SDE
21.11.2019Kolloquium Wilhelm Killing: Prof. Dr. Gérard Besson Grenoble Compactness results for non positively curved metric measured spaces
07.11.2019Kolloquium Wilhelm Killing: Prof. Dr. Friedrich Martin Schneider TU Dresden Concentration of measure and its applications in topological dynamics
31.10.2019Kolloquium Wilhelm Killing: Prof. Dr. Bachir Bekka Rennes Dual spaces of algebraic groups
24.10.2019Kolloquium Wilhelm Killing: Prof. Dr. Marc Levine Duisburg-Essen GWGW theory
17.10.2019Colloquium Wilhelm Killing New postdocs of Mathematics Münster: Scientific postdoc presentations
10.10.2019Colloquium Wilhelm Killing: Prof. Dr. Alberto Abbondandolo Universität Bochum On short closed geodesics, shadows of symplectic balls and polar bodies
11.07.2019Kolloquium Wilhelm Killing: Prof. Dr. Katrin Wendland Universität Freiburg Moonshine Phenomena
04.07.2019Kolloquium Wilhelm Killing: Dr. André Hendriques University of Oxford Three approaches to conformal field theory
27.06.2019Kolloquium Wilhelm Killing: Prof. Dr. Piotr Achinger IMPAN Homotopy types in algebraic geometry
06.06.2019Kolloquium Wilhelm Killing: Prof. Dr. Dan Segal University of Oxford Axiomatizability and profinite groups
16.05.2019Kolloquium Wilhelm Killing: Prof. Dr. Stuart White University of Glasgow Amenable Operator Algebras
09.05.2019Kolloquium Wilhelm Killing: Prof. Dr. Julian Fischer Institute of Science and Technology Austria Interface evolution problems in fluid mechanics and geometry: (Non-)Uniqueness of solutions and weak-strong uniqueness principles
25.04.2019Kolloquium Wilhelm Killing: Prof. Dr. Herbert Koch Universität Bonn The porous medium equation: properties and regularity of solutions
18.04.201915. John von Neumann-Lecture: Prof. Dr. Yves Benoist Université Paris-Sud Arithmeticity of discrete groups
11.04.2019Kolloquium Wilhelm Killing: Dr. Péter Varjú University of Cambridge The dimension theory of self-similar sets and measures
04.04.2019Kolloquium Wilhelm Killing: Prof. Dr. Yakov Kremnitzer University of Oxford Global analytic geometry and Hodge theory
24.01.2019Kolloquium Wilhelm Killing: Prof. Dr. Martin Gander Universität Genf Is Optimal Really Good in Domain Decomposition ? (or why multigrid coarse spaces might not be suitable)
17.01.2019Kolloquium Wilhelm Killing: Prof. Dr. Konrad Waldorf Greifswald Smooth functorial field theories
10.01.2019Kolloquium Wilhelm Killing: Prof. Dr. Joel Hamkins Oxford The rearrangement and subseries numbers: how much convergence suffices for absolute convergence?
13.12.2018Kolloquium Wilhelm Killing: Prof. Dr. Hartmut Führ Aachen Wavelet approximation theory, decomposition spaces and coarse geometry
06.12.2018Friedrich-Hirzebruch-Kolloquium: Prof. Dr. Annette Huber-Klawitter Uni Freiburg News on period numbers
25.10.2018Kolloquium Wilhelm Killing: Prof. Dr. Henning Krause Bielefeld Support and stratification of modular representations
05.07.2018Kolloquium Wilhelm Killing: Prof. Dr. Walter van Suijlekom Nijmegen Noncommutative geometry and gauge theories
28.06.2018Kolloquium Wilhelm Killing: Prof. Dr. William Crawley-Boevey Universität Bielefeld My struggle with the Deligne Simpson problem
21.06.201813. John von Neumann-Lecture: Prof. Dr. Emmanuel Breuillard Cambridge Approximate groups, incidence geometry and model theory
07.06.2018Kolloquium Wilhelm Killing: Dr. Damian Osajda University of Wroclaw Group cubization
03.05.2018Kolloquium Wilhelm Killing: Prof. Dr. Oliver Röndigs Universität Osnabrück Stable homotopy groups of spheres over a field
12.04.2018Prof. Dr. Gerd Faltings HCM, Universität Bonn Arakelov Theory
25.01.2018Prof. Dr. André Nies University of Auckland Two non-classical versions of the Shannon-McMillan-Breiman theorem
11.01.201812. John von Neumann Lecture: Prof. Dr. Camillo De Lellis Universität Zürich The Onsager's Theorem and beyond
21.12.2017Friedrich-Hirzebruch-Kolloquium: Prof. Dr. Don Zagier Max-Planck-Institut Bonn Modular forms and their appearances in physics
07.12.2017Prof. Dr. Jean Bellissard WWU Münster A Toy Model for Viscosity
30.11.2017Prof. Dr. Erwin Bolthausen, Universität Zürich, Vortrag Mean-field spin glasses
23.11.2017Prof. Dr. Anke Pohl, Universität Jena, Vortrag Automorphic functions, resonances, and dynamics
16.11.2017Prof. Dr. Patrick Ferrari, Universität Bonn, Vortrag Limit laws in the Kardar-Parisi-Zhang universality class
02.11.2017Prof. Dr. Karsten Urban, Universität Ulm, Vortrag Reduced Basis Methods - Prospects and Challenges
26.10.2017Prof. Dr. Gunther Cornelissen, Utrecht University, Vortrag Dynamical zeta functions: where the wild things are
12.10.2017Prof. Dr. Marius Junge, University of Illinois at Urbana-Champaign, Vortrag A harmonic analysis approach to quantum metric spaces
20.07.2017Professor Dr. Tobias Colding, MIT, Vortrag Level set method for motion by mean curvature
06.07.2017Prof. Dr. Robert Pego, Carnegie Mellon University, Vortrag Merging-splitting group dynamics by Bernstein function theory
29.06.2017Prof. Dr. Matthias Lesch, Universität Bonn, Vortrag Spectral geometry of singular spaces
22.06.2017Remmert-Gedenk-Kolloquium Prof. Dr. Thomas Peternell, Universität Bayreuth, Vortrag: Holomorphiekonvexität, die Remmert-Reduktion und eine Vermutung von Shafarevitch
22.06.2017Remmert-Gedenk-Kolloquium Prof. Dr. h.c. mult. Alan T. Huckleberry, RUB und Universität Bremen, Vortrag: Reinhold Remmert: vielschichtige Verdienste in der Mathematik
14.06.2017Prof. Dr. Arnd Scheel, University of Minnesota, Vortrag Moduli spaces of growth patterns
01.06.2017Prof. Dr. Cornelis Kraaikamp, TU Delft, Vortrag Surgery on Continued Fractions
24.05.2017Dr. Konstanze Rietsch, King's College, London, Vortrag Mirror symmetry and Grassmannians
11.05.2017Prof. Dr. Wolfgang Steimle, Universität Augsburg, Vortrag Families of diffeomorphisms and of metrics of positive scalar curvature
04.05.201711. John-von-Neumann-Lecture: Prof. Dr. Sorin Popa University of California, Los Angeles Structure and randomness in von Neumann algebras
20.04.2017Prof. Dr. Oleg Pikhurko, Warwick, Vortrag Measurable Combinatorics
09.02.2017Prof. Dr. Duco van Straten, Universität Mainz, Vortrag tba
02.02.2017Prof. Dr. Richard Weiss, Tufts University, Vortrag Descent in Buildings
26.01.2017Prof. Dr. Karl-Theodor Sturm, Universität Bonn, Vortrag Heat flow on time-dependent metric measure spaces and superRicci flows
19.01.2017Prof. Dr. Klaas Landsman, Radboud University, Vortrag Quantization and Operator Algebras
21.12.2016Oberseminar Differentialgeometrie Marco Radeschi, Münster, Vortrag: tba
08.12.2016Prof. Dr. Michael Ortiz, Caltech, Vortrag Optimal transport methods in computational mechanics
01.12.2016Prof. Dr. Gigliola Staffilani, MIT, Vortrag Recent developments on certain dispersive equations as infinite dimensional Hamiltonian systems
24.11.2016Dr. Moritz Groth, Universität Bonn, Vortrag: Grothendieck derivators: taking derived Grothendieck derivators: taking (derived) limits serious
17.11.2016Prof. Dr. José Antonio Carrillo, Imperial College London, Vortrag Nonlinear aggregation-diffusions in the diffusion-dominated and fair-competitions regimes
10.11.2016Prof. Dr. Holger Reich, FU Berlin, Vortrag Assembly maps for algebraic K-theory and topological cyclic homology
03.11.201610. John von Neumann Lecture: Prof. Dr. Endre Süli University of Oxford Navier-Stokes-Fokker-Planck Systems: Modelling, Analysis, Approximation, Computation
20.10.2016Dr. Edward Belbruno, Princeton University, Vortrag Ballistic Capture Transfer in the Three and Four-Body Problems with Applications
14.07.2016Prof. Dr. Holger Rauhut, RWTH Aachen, Vortrag Sparse and Low Rank Recovery
07.07.2016Prof. Dr. Gerard Besson, Universität Grenoble, Vortrag tba
30.06.2016Prof. Dr. Alessandra Iozzi, ETH Zürich, Vortrag Rotation number, old and newer
23.06.2016Prof. Dr. Nathanael Berestycki, University of Cambridge, Vortrag The dimer model: universality and conformal invariance
16.06.2016John-von-Neumann-Lecture Prof. Dr. Günter Ziegler, FU Berlin, Vortrag: Geometry vs. Topology: On 4-Polytopes and 3-Spheres
09.06.2016Prof. Dr. Bernd Kawohl, Universität zu Köln, Vortrag Geometric Inequalities
02.06.2016Prof. Dr. Bachir Bekka, Université de Rennes I, Vortrag Dynamics of groups of affine transformations of homogeneous spaces
25.05.2016Prof. Dr. Boris Zilber, University of Oxford, Vortrag The geometric semantics of algebraic quantum mechanics
12.05.2016Prof. Dr. Michael Baake, Universität Bielefeld, Vortrag Dynamical systems of number-theoretic origin in the theory of aperiodic order
04.05.2016Prof. Dr. Alain Chenciner, Universität Paris VII, Vortrag Angular momentum and Horn's problem
21.04.2016Prof. Dr. Arnd Scheel University of MinnesotaProf. Dr. Arnd Scheel (University of Minnesota) Coherent structures in spatially extended dynamical systems
28.01.2016Prof. Dr. Eva Zerz, RWTH Aachen, Vortrag Systems and control theory - an algebraic point of view
21.01.2016Prof. Dr. Maria Westdickenberg, RWTH Aachen, Vortrag Complex energy landscapes: distances, convergence rates, and rare events
14.01.2016Prof. Dr. Nalini Anantharaman, Université d'Orsay, Vortrag Quantum ergodicity on large graphs
07.01.2016Dr. Maria Colombo, ETH Zürich, Vortrag Flows of non-smooth vector fields and applications to PDEs
17.12.2015Prof. Dr. Ulrike Tillmann, University of Oxford, Vortrag Homotopy methods for geometric groups
10.12.2015Prof. Dr. Dorothea Bahns, Universität Göttingen, Vortrag Distributions, quantum fields and Gabor Analysis
03.12.2015Prof. Dr. Claire Voisin, Institut de Mathematique de Jussieu, Vortrag New results on rationality questions
26.11.2015Prof. Dr. Silvia Sabatini, Universität Köln, Vortrag 12 and 24 in symplectic geometry and combinatorics
19.11.2015Prof. Dr. Annette Huber-Klawitter, Albert-Ludwigs-Universität Freiburg, Vortrag Differential forms in algebraic geometry -- a new perspective in the singular case
12.11.2015Prof. Dr. Ursula Hamenstädt, Universität zu Bonn, Vortrag Geometry of the moduli space of curves
05.11.2015Prof. Dr. Eva Viehmann, TU München, Vortrag The geometry of Newton strata
16.07.2015Prof. Dr. Massimo Bertolini, Duisburg-Essen, Vortrag Recent advances on the Birch and Swinnerton-Dyer conjecture
09.07.2015Prof. Dr. Misha Kapovich, University of California, Vortrag Finsler compactification of nonpositively curved symmetric spaces
02.07.2015Prof. Dr. Gianluca Crippa Universität BaselProf. Dr. Gianluca Crippa (Universität Basel) Optimality of the Gronwall estimate for ODEs
02.07.2015Prof. Dr. Gianluca Crippa, Basel, Vortrag tba
25.06.2015John-von-Neumann-Lecture Prof. Dr. Eli Glasner, Tel-Aviv, Vortrag: tba
25.06.20158. John von Neumann Lecture: Prof. Dr. Eli Glasner Tel Aviv University Kazhdan's Property T and the Geometry of the Collection of Invariant Measures
18.06.2015Prof. Dr. Emmanuel Breuillard Université ParisProf. Dr. Emmanuel Breuillard (Université Paris) Growth of groups and approximate subgroups
17.06.2015Prof. Dr. Alexander Lubotzky, Einstein Institute Jerusalem, Vortrag Fritz Grunewald memorial talk: Arithmetic quotients of the mapping class group
11.06.2015Prof. Dr. Hanspeter Kraft, Basel, Vortrag Endomorphisms and Automorphisms of Affine Varieties
21.05.2015Prof. Dr. Ellen Baake, Bielefeld, Vortrag Ancestral selection graph meets lookdown construction
07.05.2015Prof. Dr. Vincent Rivasseau, Paris-Sud, Vortrag Random Geometry and Physics
30.04.2015Prof. Dr. Stephan Luckhaus Universität LeipzigProf. Dr. Stephan Luckhaus (Universität Leipzig) Geometry, Rigidity, Plasticity
23.04.2015Prof. Dr. Dietmar Bisch, Vanderbilt, Vortrag Subfactors with infinite representation theory
16.04.2015Prof. Dr. Axel Voigt TU DresdenProf. Dr. Axel Voigt (TU Dresden) A generic approach to cell motility by active polar gels
29.01.2015Dr. Tobias Dyckerhoff, Oxford, Vortrag Triangulated surfaces in triangulated categories
22.01.2015Prof. Dr. Rudolf Grübel, Universität Hannover, Vortrag Randomly growing discrete structures
15.01.2015Prof. Dr. Peter Friz, TU Berlin, Vortrag Rough paths
08.01.2015Prof. Dr. Hansjörg Geiges, Universität Köln, Vortrag Geometry of the Kepler problem in celestial mechanics
11.12.2014Prof. Dr. Karl-Henning Rehren, Institut für Theoretische Physik Göttingen, Vortrag Tensor categories of endomorphisms and extensions of von Neumann algebras
04.12.2014Prof. Dr. Gunter Malle, TU Kaiserslautern, Vortrag Local-global conjectures in the representation theory of finite groups
27.11.2014Prof. Dr. Annette Werner, Universität Frankfurt, Vortrag Drinfeld's half-spaces over finite fields
20.11.2014Prof. Dr. Christoph Schwab ETH ZürichProf. Dr. Christoph Schwab (ETH Zürich) High-Dimensional Numerical Integration in Bayesian Estimation for Parametric Operator Equations
13.11.20147. John von Neumann Lecture: Prof. Dr. Sylvia Serfaty Laboratoire Jacques-Louis Lions Université Pierre et Marie Curie Paris 6, Courant Institute, New York Questions of crystallization in systems with Coulomb and Riesz interactions
06.11.2014Prof. Dr. Bernd Siebert, Universität Hamburg, Vortrag The maximal degeneration toolkit, generalized theta functions and mirror symmetry
30.10.2014Prof. Dr. Jochen Heinloth, Universität Duisburg-Essen, Vortrag Geometry of moduli spaces of Higgs bundles on curves
23.10.2014Prof. Dr. Bernold Fiedler FU BerlinProf. Dr. Bernold Fiedler (FU Berlin) Reaction and diffusion in several space dimensions- an invitation
16.10.2014Prof. Dr. Juan J. L. Velázquez Universität BonnProf. Dr. Juan J. L. Velázquez (Universität Bonn) Singularity formation for kinetic equations with cubic nonlinearities
10.07.2014Prof. Dr. Alexander Kechris, Caltech Pasadena, Vortrag Dynamics of non-archimedean Polish groups
03.07.2014Prof. Dr. Giovanni Felder, ETH Zürich, Vortrag: Derived representation schemes after Berest, Khachatryan and Ramadoss Derived representation schemes (after Berest, Khachatryan and Ramadoss)
26.06.2014Prof. Dr. Barbara Niethammer Universität BonnProf. Dr. Barbara Niethammer (Universität Bonn) On Smoluchowski's classical model for aggregation phenomena
25.06.2014Dr. Malte Witte Universität Heidelberg "Nichtkommutative Grothendieck-Spurformeln und Iwasawa-Hauptvermutungen in Charakteristik p"
18.06.2014Prof. Dr. Stefan Schwede, Universität Bonn, Vortrag Equivariant properties of symmetric products
05.06.2014Prof. Dr. Claude LeBrun, Stony Brook University, Vortrag Four-Manifolds, Einstein Metrics, and Differential Topology
28.05.2014Prof. Dr. Peter Scholze, Universität Bonn, Vortrag P- adic cohomology of p- adic spaces
22.05.2014Prof. Dr. Eduard Feireisl Universität PragProf. Dr. Eduard Feireisl (Universität Prag) Strange solutions for the equations in fluid dynamics
08.05.2014Prof. Dr. Michael Dettweiler, Universität Bayreuth, Vortrag Starre lokale Systeme
24.04.2014Prof. Dr. Kathrin Bringmann Universität KölnProf. Dr. Kathrin Bringmann (Universität Köln) Ramanujan and asymptotic formulas
24.04.2014Prof. Dr. Kathrin Bringmann, Universität Köln, Vortrag tba
10.04.2014Prof. Dr. Siddharta Mishra ETH ZürichProf. Dr. Siddharta Mishra (ETH Zürich) Computing the entropy measure valued solutions of systems of hyperbolic conservation laws.
30.01.2014Prof. Dr. Dr. hc Hélène Esnault, FU Berlin, Vortrag Stratifications and the Étale fundamental group.
23.01.2014Prof. Dr. Frank den Hollander, Universität Leiden Holland, Vortrag Extremal geometry of a Brownian porous medium
16.01.2014Prof. Dr. Christian Spannagel, PH Heidelberg, Vortrag Flipping lectures - Die umgedrehte Mathematikvorlesung
09.01.2014Prof. Alain Valette, Université de Neuchâtel Schweiz, Vortrag The Kadison-Singer problem
12.12.20135. John von Neumann Lecture: Prof. Dr. Simon Brendle Stanford University Minimalflächen in der 3-Sphaere und die Lawson-Vermutung
05.12.2013Prof. Dr. Gregory Cherlin, Rutgers University USA, Vortrag Homogeneity and Universality, from Urysohn and Ramsey to today
28.11.2013Prof. Dr. Barbara Wohlmuth TU München Prof. Dr. Barbara Wohlmuth (TU München ) Interfaces, corners and point sources
21.11.2013Prof. Dr. Alain -Sol Sznitman, ETH Zürich, Vortrag Random interlacements and the local geometry of random walks
14.11.2013Prof. Dr. Janko Latschev, Universität Hamburg, Vortrag The Gromov width of symplectic manifolds
07.11.2013Prof. Dr. Jürgen Hausen, Universität Tübingen, Vortrag Algebraic torus actions of complexity one
31.10.2013Von Formoptimierung und energetischen Einsichten in optimale Geometrien, Prof. Dr. Benedikt Wirth WWUVon Formoptimierung und energetischen Einsichten in optimale Geometrien, Prof. Dr. Benedikt Wirth (WWU) Auf diesen Vortrag wird besonders hingewiesen!
24.10.2013Prof. Dr. Jochen Heinloth, Universität Duisburg-Essen, Vortrag Kloosterman sums and the geometric Langlands correspondence
17.10.2013Dr. Emanuele Spadaro MPI Leipzig Dr. Emanuele Spadaro ( MPI Leipzig ) On minimal surfaces and their singularities
18.07.2013Prof. Dr. Laszlo Székelyhidi Universität LeipzigProf. Dr. Laszlo Székelyhidi ( Universität Leipzig) Bending surfaces and turbulent energy cascades.
11.07.2013Prof. Dr. Soren Eilers, Universität Kopenhagen, Vortrag Geometric classification of graph C*-algebras
04.07.2013Prof. Dr. Catharina Stroppel, Universität Bonn, Vortrag Categorification of knot invariants
27.06.2013Prof. Dr. Felix Schlenk, Université Neuchatel, Vortrag Slow volume growth and the contact Bott-Samelson theorem
20.06.20134. John von Neumann Lecture: Prof. Dr. Zlil Sela Hebrew University of JerusalemLow dimensional topology and the elementary theory of group,
13.06.2013Prof. Dr. habil. Reiner Schätzle Universität TübingenProf. Dr. habil. Reiner Schätzle (Universität Tübingen) New explicit examples of conformally constrained Willmore surfaces
16.05.2013Prof. Dr. Martin Rumpf Universität BonnProf. Dr. Martin Rumpf (Universität Bonn) Variational Time Discretization of Geodesic Calculus in Shape Space
08.05.2013Prof. Dr. Ernst Heintze, Universität Augsburg, Vortrag Isoparametric submanifolds and Kac-Moody algebras
25.04.2013Prof. Dr. Ralf Meyer, Universität Göttingen; Vortrag Crossed modules as symmetries in noncommutative geometry.
18.04.2013Prof. Dr. Marc Levine, Universität Essen-Duisburg, Vortrag Connections between algebraic geometry and homotopy theory
24.01.2013Prof. Dr. Bernd Ammann, Universität Regensburg, Vortrag The Yamabe constant of products and applications
17.01.2013Prof. Dr. Thomas Lengauer, MPI Saarbrücken, Vortrag Bioinformatics -assisted HIV Therapy– spearheading personal medicine?
17.01.2013Prof.Dr. Dr. Thomas Lengauer Direktor am Max-Planck-Institut für Informatik, SaarbrückenProf.Dr. Dr. Thomas Lengauer (Direktor am Max-Planck-Institut für Informatik, Saarbrücken) Bioinformatics -assisted HIV Therapy– spearheading personal medicine?
10.01.2013Prof. Dr. Manfred Einsiedler, ETH Zürich, Vortrag Mixing and distribution properties of orbits on homogeneous spaces
20.12.2012Prof. Dr. Nicolas Bergeron, Université Pierre et Marie Curie Paris, Vortrag: Arithmetic manifolds: prehistory and some Arithmetic manifolds: prehistory and (some) recent developments
13.12.2012Prof. Dr. Wolfgang Lück, Universität Bonn, Vortrag Homological growth and L^2-invariants
06.12.2012Prof. Dr. Johannes Buchmann, TU Darmstadt ,Future-Proof Digital Signatures
29.11.2012Prof. Dr. Gilbert Levitt, Université de Caen, Vortrag Automorphisms of hyperbolic groups
22.11.20123. John von Neumann Lecture: Prof. Dr. Stefan Müller MPI Bonn The Mathematics of Packing, Crumbling and Folding
08.11.2012Prof. Dr. Thomas Schick, Universität Göttingen, Vortrag Coarse geometry and index theory
25.10.2012Prof. Dr. Martin Hairer, University of Warwick, Vortrag Solving the KPZ equation
11.10.2012Prof. Dr. Anton Bovier Universität Bonn "The extremal process of branching Brownian motion".
28.06.2012Professorin Katrin Wendland Uni Freiburg "Singularities and topological quantum field theories"
21.06.2012Professorin Margit Rösler Universität Paderborn "Multivariable hypergeometric functions and.."
14.06.2012Prof. Dr. Gregoire Allaire, Ecole Polytechnique "Looking for the hot spot: homogenization of...."
06.06.2012Professor Nigel Hitchin University of Oxford "Differential geometry over the quaternion"
24.05.2012Professor Stephan Luckhaus Universität Leipzig "Free Discontinuity Problems-Mumford Shah type..."
16.05.2012Professor Matthias Schwarz Universität Leipzig "Floer Homology as an Infinite-Dimensional....."
10.05.2012Professor Roberto Longo University of Rome"An analog of the Beurling-Lax theorem and Quantum..."
03.05.2012Prof. Dr. Georg Weiss Universität Düsseldorf "Singularities of axisymmetric flows with gravity".
26.04.2012Professor Friedrich Götze Universität Bielefeld"Geometry of Numbers and the Central Limit Theory"
19.04.2012Professorin Simone Gutt Universität Brüssel "*$Mp^c$-*structures, quantization and symplectic Di"
12.04.2012Professor Peter Teichner MPI Bonn "Whitney Towers in Four Dimensions"
05.04.2012Professor Mikael Rørdam University of Copenhagen "Group actions on compact and locally....."
26.01.2012Professor Tristan RivièreETH Zürich "Gauge Theory in the Calculus of Variations"
19.01.2012Professor Klaus Altmann Freie Universität Berlin "Deformations of toric varieties"
12.01.2012Professor Jürgen Jost MPI für Mathematik Leipzig "Information Geometry and Mathematical...."
01.12.2011Professor Peter Littelmann Universität Köln "On representation theory, combinatorics and geom"
24.11.2011Profess Stefan Müller-Stach Universität Mainz "On a theorem of Hirzebruch"
17.11.2011Professor Helge Glöckner Universität Paderborn "Ascending unions Lie groups"
10.11.2011Professor Stefan Bauer Universität Bielefeld "Differential equations and stable homotopy".
03.11.2011Professor David Kerr Texas A&M University "Entropy and soficity"
27.10.2011Professor Roland Speicher Universität Saarbrücken "Quantum groups made easy"
20.10.2011Professor Sergio Conti Universität Bonn "Scale-bridging in models of crystal plasticity"
13.10.2011Professor Anand Pillay University Leeds "Nash manifolds and groups"
07.07.2011Manfred Lehn Universität Mainz "Der Satz von Grothendieck-Brieskorn-Slodowy und symplektische Hyperflächen."
30.06.2011Michael Puschnigg Université Aix-Marseille "The Chern-Connes character is not rationally injective"
09.06.2011Kai Cieliebak Universität München "Symplectic aspects of Stein manifolds"
26.05.2011Simon Thomas Rutgers University New Brunswick, New Jersey, USA"A descriptive view of combinatorial group theory"
19.05.2011Ragnar Buchweitz University of Toronto Scarborough "Noncommutative Desingularization of Singularities — Why and What for?"
12.05.2011Michelle Bucher-Karlsson Universität Genf"Volumes:Riemannian and simplicial"
05.05.2011Stefan Schroeer Universität Düsseldorf "Enriques Manifolds"
28.04.2011Ulrich Goertz Universität Duisburg Essen"Affine Deligne-Lusztig varieties"
21.04.2011Stefan Gille Universität München "Chow motives of surfaces"
07.04.2011Jesper Grodal Universität Kopenhagen "Finite loop spaces"
27.01.2011Cornelia Drutu University of Oxford "Analogies between lattices in semisimple groups and mapping class groups
20.01.2011Dietmar Salamon ETH Zürich"Existence and uniqueness problems in symplectic topology"
13.01.2011Christoph Thiele University of California, Los Angeles, zur Zeit Universität Bonn "Carleson's theorem, variations and applications
09.12.2010Michael Weiss University of Aberdeen "Pontryaginklassen und glatte Automorphismen von Scheiben "
02.12.2010Peter Fiebig Universität Erlangen-Nürnberg "Über Lusztigs Charakterformel"
25.11.2010Kai-Uwe Bux Bielefeld "Combinatorial Morse Theory: how and why"
18.11.2010Humboldt-Kolloquium: Alan Carey Canberra, Australien Index theory in Mathematics and Physics.
18.11.2010Humboldt-Kolloquium: Uffe Haagerup Kopenhagen, Dänemark Random Matrices in Operator Algebra Theory.
11.11.2010Nicolas Monod Universität Genf "Littlewood and large forest"
04.11.2010Stefan Friedl Köln"Knots which bound disks in the 4-ball."
28.10.2010Michael Joswig Darmstadt "Tropical Combinatorics"
22.07.2010Anders Karlsson GenfAnders Karlsson (Genf)
15.07.2010Anton Deitmar TuebingenAnton Deitmar (Tuebingen)
08.07.2010Martin Bridson Oxford "Rigidity, mapping class groups, and automorphism groups of free groups" Eröffnungskolloquium des SFB 878
01.07.2010Prof. Anton Pretunin Penn State University"Almost definite curvature"
24.06.2010Gunnar Carlsson Stanford"Topology and Data"
17.06.2010Ken Dykema Texas "On approximation of groups by permutations and operators by matrices" -auf diesen Vortrag wird besonders hingewiesen
10.06.2010Karl-Hermann Neeb Darmstadt "Semiboundedness in the representation theory of infinite dimensional Lie groups"
02.06.2010Bernd Sturmfels BerkeleyBernd Sturmfels (Berkeley)
20.05.2010Herbert Kurke HU BerlinHerbert Kurke (HU Berlin)
06.05.2010Valentin Blomer GöttingenValentin Blomer (Göttingen)
22.04.2010Markus Reineke WuppertalMarkus Reineke (Wuppertal)
15.04.2010Dugald MacPherson Leeds "Pseudofinite groups"
28.01.2010Donna Testerman Lausanne "Subgroup structure and representation theory"
21.01.2010Professor Dr. Andreas Thom Universität Leipzig "Stability of unitary representations"
14.01.2010Professor Martin Taylor University of Manchester "Arithmetic Euler Characteristics"
07.01.2010Professor Dr. Jan Schroer Uni Bonn "What is a good basis of a polynomial ring?"
17.12.2009Professor Dr. Thomas Vogel MPIM Bonn "Open books and their applications"
10.12.2009Professor Dr. Fritz Grunewald Universität Düsseldorf "Lineare Darstellungen der Automorphismengruppe einer freien Gruppe und von Abbildungsklassengruppen"
03.12.2009Professor Dr. Ernst-Ulrich Gekeler Universität Saarbrücken "Elliptische Kurven und Zufall"
19.11.2009Professor Ruth Charney Brandeis University, Boston "Right-angled Artin groups and their Automorphisms"
12.11.2009Professor Dr. Ulrich Bunke Universität Regensburg "Pfaffians and String Structures"
05.11.2009Professor George Willis University Newcastle, Australia "Superrigidity of homomorphisms from arithmetic groups having locally compact targets"
29.10.2009Professor Karen Vogtmann Cornell University, Ithaca NY "Outer Spaces"
23.07.2009Prof. Dr. Gerhard Huisken Max-Planck-Institut für Gravitationsphysik"Isoperimetrische Ungleichung und Masse in der Allgemeinen Relativitätstheorie"
23.07.2009Fragestunde für Studierende zum Kolloquiumsvortrag Professor Gerhard Huisken
09.07.2009Prof. Peter Topping Univ. Warwick "Harnack inequalities for Ricci flow"
25.06.2009Prof. Stanislaw Woronowicz Univ. WarszawaProf. Stanislaw Woronowicz (Univ. Warszawa)
18.06.2009Prof. Viktor Schroeder Univ. Zürich "Asymptotic geometry of metric spaces"
10.06.2009Prof. Sylvain Cappell New York "Invariants of Spaces and Singularities of Maps"
28.05.2009Prof. Lizhen Ji Michigan "Coarse Schottky problem and equivariant cell decomposition of Teichmüller space"
20.05.2009Prof. Guoliang Yu Vanderbilt University, Tennessee "K-theory for expanders"
14.05.2009Prof. Dr. Martin Ziegler Freiburg "Computable functions on the reals"
07.05.2009Prof. Francois Loeser Paris "From counting points to motivic integration: the geometry behind computing integrals"
30.04.2009Prof. Dr. Anatoly Vershik St. Petersburg "Universal Urysohn metric spaces and linear rigidity"
23.04.2009Prof. Dr. Matthias Kreck Bonn "Codes, arithmetic and topology"
05.02.2009Stefaan Vaes "Von Neumann algebras and measure preserving actions of countable groups"
29.01.2009Andrzej Zuk "Groups generated by automata"
22.01.2009Prof. Dr. Hamenstädt "Geometric properties of the mapping class group"
15.01.2009Prof. Dr. Reinhard Farwig "Das Milleniumsproblem für die Navier-Stokes-Gleichung"
08.01.2009Prof. Andreas Winter "Entropic properties of quantum channels and random channels"
18.12.2008Gitta Kutyniok "Shearlets: Sparse Decompositions of Anisotropic Phenomena"
23.10.2008Uri Bader "The Poisson Boundary of a group, its properties and applications to rigidity"
16.10.2008Jason Behrstock "Geometry and rigidity of mapping class groups"
29.09.200829.09. - 01.10.2008 "Buildings 2008"
10.07.2008Sylvain Maillot Strasbourg Ricci flow and the Poincare conjecture.
22.11.200722.11.2007: Walter Gubler Dortmund "Tropische analytische Geometrie"