Disputation Jorge Olarte

Ort: Arnimallee 3, SR 119

05.12.2019 | 16:00

Einstein Workshop Polytopes and Algebraic Geometry 2019

This will be a three-day workshop with lectures, presentations and informal discussions on polytopes and their relations to algebraic geometry. It is funded by the Einstein Foundation Berlin , as part of Francisco Santos' Einstein Visiting Fellowship at FU Berlin for 2016-2020. It is one of the activities in the thematic Einstein semester Varieties Polyhedra and computations .

02.12.2019 - 04.12.2019

Einstein Workshop Geometric and Topological Combinatorics

Ort: Freie Universität Berlin, Königin Luise Straße 24/26, 14195 Berlin

29.10.2018 - 31.10.2018

Encuentro Colombiano de Combinatoria ECCO 2018

Günter M. Ziegler (FU Berlin): „Polytopes — Extremal Examples and Combinatorial Parameters“

Ort: Universidad del Norte, Barranquilla, Colombia

05.06.2018 - 16.06.2018

Einstein Workshop Discrete Geometry and Topology

This will be a four day workshop with lectures, presentations and informal discussions on discrete geometry and topology, and related topics (combinatorial topology, computational geometry, polytope theory). It is primarily funded by the Einstein Foundation Berlin , as part of Francisco Santos' Einstein Visiting Fellowship at FU Berlin for 2016-2019. Additional funding is provided by the project  Discretization in Geometry and Dynamics  (SFB Transregio 109) and the  Berlin Mathematical School . Read more.

Ort: Freie Universität Berlin

13.03.2018 - 16.03.2018

Disputation Lauri Loiskekoski

Ort: Seminar Room Arnimallee 2 14195 Berlin

21.12.2017 | 14:00


World-Café anlässlich der internationalen Open Access Week für Wissenschaftler/innen und Mitarbeiter/innen der Freien Universität.

Ort: Freie Universität Berlin, Seminarzentrum, Raum: L 113 und L 116 (Erdgeschoss), Otto-von-Simson-Str. 26 (Silberlaube), 14195 Berlin

25.10.2017 | 13:00 - 16:00

ÖMG-DMV-Jahrestagung 2017

Ort: Paris-Lodron University of Salzburg

11.09.2017 - 15.09.2017
14.08.2017 - 15.12.2017

Reading Group on Real Algebraic Geometry

Ort: Max Planck Institute for Mathematics in the Sciences Inselstraße 22 04103 Leipzig Germany

03.07.2017 - 07.07.2017

Conference on Applied Topology

Ort: Banach Center, Będlewo, Polen

25.06.2017 - 01.07.2017
24.06.2017 | 17:00 - 23:59

Discrete Geometry and Convexity - BÁRÁNY 70

Ort: Renyi Institute of Mathematics, Budapest

19.06.2017 - 23.06.2017

Disputation Albert Haase

The square peg problem is at least 106 years old and still unsolved in full generality. It asks whether any simple closed curve in the plane inscribes a square. By “inscribes a square” we mean that the curve contains the four vertices of a square. The square itself may intersect both the bounded and unbounded components. Substantial progress on the problem has been made using methods from equivariant topology: Piecewise linear, analytic, convex, and locally monotone curves are all known to inscribe squares. We present a recent positive result by T. Tao that takes an entirely different, “analytical” approach involving areas defined by line integrals and Stokes’ theorem.

Ort: Seminar Room

14.06.2017 | 10:00

Polynomials and Polytopes

This is a workshop within the project on NonLinear Algebra that is funded for 2015-2018 by the Einstein Foundation . The workshop is also supported by the TU Berlin , the MPI for Mathematics in the Sciences in Leipzig, and the Emmy Noether Programm of the DFG .

Ort: MA 144 Straße des 17. Juni 136 10623 Berlin


Conference on Convex, Discrete and Integral Geometry

Ort: Banach Center, Będlewo, Polen

04.06.2017 - 09.06.2017

Jörgshop TU Berlin, 2017

Ort: TU Berlin MA041 (ground floor) of the Mathematics Building Strasse des 17 Juni 136

02.06.2017 - 03.06.2017

Seminar on Non-Linear Algebra

Ort: MPI für Mathematik in den Naturwissenschaften Leipzig, E1 05 (Leibniz-Saal)

30.05.2017 | 11:00


Die »Euler-Vorlesung in Sanssouci« ist eine Mathematik-Vorlesung in festlichem Rahmen an der Universität Potsdam. Die Veranstaltung wird seit 1993 alljährlich von den Berliner und Potsdamer Mathematischen Instituten, der Berliner Mathematischen Gesellschaft und vielen weiteren  Veranstaltern gemeinsam ausgetragen. Der mathematische Hauptvortrag wird von einer hochkarätig besetzten Jury ausgewählt wird. Ferner gibt es einen historischen Vortrag und ein musikalisches Rahmenprogramm. Die Euler-Vorlesung ist nach Leonhard Euler benannt, der mit der Berliner und Potsdamer Mathematik besonders verbunden war. Unter anderem war Euler langjährig als Direktor der Mathematischen Klasse der Berliner Akademie und am Hof Friedrichs des Großen in Potsdam tätig.

Ort: Auditorium Maximum im Haus 8 der Universität Potsdam Am Neuen Palais 14476 Potsdam

19.05.2017 | 14:00

Disputation Tobias Friedl

Ort: Seminar Room

19.05.2017 | 10:00
15.05.2017 - 19.05.2017

Workshop „Discrete Geometry“

Ort: Mathematisches Forschungsinstitut Oberwolfach

09.04.2017 - 15.04.2017

MNU Bundeskongress Aachen

Günter M. Ziegler: “Panorama der Mathematik”

Ort: Aachen


Salon Sophie Charlotte der BBAW

Ort: Akademiegebäude am Gendarmenmarkt, Berlin


Workshop „Combinatorics“

Ort: Mathematisches Forschungsinstitut Oberwolfach

01.01.2017 - 06.01.2017
18.09.2016 - 23.09.2016
24.07.2016 - 31.07.2016

Mathematics of Jirí Matoušek

Ort: Charles University, Prague

23.07.2016 - 28.07.2016
18.07.2016 - 22.07.2016

John von Neumann Lecture 2016

Ort: Universität Münster


DMV & GAMM Jahrestagung

Ort: TU Braunschweig

07.03.2016 - 11.03.2016
12.02.2016 | 16:00

Borel Seminar

Ort: Les Diablerets, Switzerland

24.01.2016 - 29.01.2016

Discrete Geometry Seminar- Matthias Henze

Doignon proved a discrete version of Helly's theorem claiming that a finite family of convex sets in R^n intersects in an integral point if every subfamily of size at most 2^n does so. Motivated by applications in integer programming, Aliev et al. recently obtained a quantitative version of this result, which guarantees that a finite family of convex sets intersects in k integral points whenever every subfamily of size at most c_n(k) does so. The best current upper bound on the minimal such constant c_n(k) grows linearly with the parameter k. Based on a connection to the number of boundary integral points in strictly convex sets, we show that the asymptotic behavior of c_n(k) is sublinear in dimension two and we determine the exact value of c_n(k) for k at most four. ------

Ort: Seminar Room, Arnimallee 2, FU Berlin

10.12.2015 | 14:15

7. Thüringer Geometrietag

Ort: Friedrich-Schiller-Universität, Jena

04.12.2015 - 05.12.2015

Discrete Geometry Seminar - Moritz Schmitt

Ort: Seminar Room, Arnimallee 2, FU Berlin

29.10.2015 | 14:00

Discrete Geometry Seminar - Michal Lason

Ort: Seminar Room, Arnimallee 2, FU Berlin

22.10.2015 | 14:00

Discrete Geometry Seminar - Alexander Engström

Ort: Seminar Room, Arnimallee 2, FU Berlin

15.10.2015 | 14:00

Geometry and Symmetry Conference

The conference will celebrate the 60th birthdays in 2015 of  Karoly Bezdek  (University of Calgary, Canada and University of Pannonia, Hungary) and  Egon Schulte  (Northeastern University, USA). The theme of the conference will be “Geometry and Symmetry”, with emphasis on recent progress on aspects of discrete geometry in which Egon and Karoly have made remarkable contributions. The program of the conference will consist of invited lectures and contributed talks.

Ort: Veszprém, Hungary

29.06.2015 - 03.07.2015

Tsukerman - Circumcenter of mass

Ort: Seminar Room, Arnimallee 2, FU Berlin

18.06.2015 | 14:15

Lange Nacht der Wissenschaften

Ort: Arnimallee 6, FU Berlin

13.06.2015 | 17:00
12.06.2015 | 13:30

Discrete Geometry Seminar- Samuel Fionrini

Ort: Seminar Room, Arnimallee 2, FU Berlin

11.06.2015 | 14:15
29.05.2015 - 30.05.2015
21.05.2015 | 14:15

Distributed Processes on Scale-Free Networks -- Tobias Friedrich

Lecture - 14:15   Tobias Friedrich -  HPI, Universität Potsdam  Distributed Processes on Scale-Free Networks Abstract:   The node degrees of large real-world networks often follow a power-law distribution. Such scale-free networks can be social networks, internet topologies, the web graph, power grids, or many other networks from literally hundreds of domains. The talk will introduce three mathematical models of scale-free networks (preferential attachment graphs, Chung-Lu graphs, hyperbolic random graphs) and analyze some of their properties. We then study three distributed processes and algorithms on these network models (rumor spreading, load balancing, de-anonymization) and present several open problems. The talk assumes no prior knowledge about scale-free networks or distributed computing.  Colloquium - 16:00   Fidaa Abed -  Technische Universität Berlin  Optimal Coordination Mechanisms for Multi-Job Scheduling Games Abstract:   We consider the unrelated machine scheduling game in which players control subsets of jobs. Each player's objective is to minimize the weighted sum of completion time of her jobs, while the social cost is the sum of players' costs. The goal is to design simple processing policies in the machines with small coordination ratio, i.e., the implied equilibria are within a small factor of the optimal schedule. We work with a weaker equilibrium concept that includes that of Nash.  We first prove that if machines order jobs according to their processing time to weight ratio, a.k.a. Smith-rule, then the coordination ratio is at most 4, moreover this is best possible among nonpreemptive policies. Then we establish our main result. We design a preemptive policy,  externality , that extends Smith-rule by adding extra delays on the jobs accounting for the negative externality they impose on other players.. For this policy we prove that the coordination ratio is 1+ φ ≈ 2.618, and complement this result by proving that this ratio is best possible even if we allow for randomization or full information. Finally, we establish that this externality policy induces a potential game and that an ε-equilibrium can be found in polynomial time. An interesting consequence of our results is that an ε-local optima of $R|\,|\sum w_jC_j$ for the jump (a.k.a. move) neighborhood can be found in polynomial time and are within a factor of 2.618 of the optimal solution. The latter constitutes the first direct application of purely game-theoretic ideas to the analysis of a well studied local search heuristic. 

Ort: @TU MA 041

11.05.2015 | 14:15
07.05.2015 | 14:15

Hodge theory and combinatorics - Adiprasito

Ort: Seminar Room, Arnimallee 2, FU Berlin

28.04.2015 | 14:15
24.04.2015 | 16:00
23.04.2015 | 14:15
23.03.2015 - 26.03.2015
16.02.2015 - 17.02.2015

Flag Vector Spaces of Polytopes, Spheres and Eulerian Lattices

Ort: Seminar Room, Arnimallee 2, FU Berlin

12.02.2015 | 14:15
02.02.2015 | 14:15

Moduli of Tropical Plane Curves- Sarah Brodsky

Ort: Seminar Room, Arnimallee 2, FU Berlin

29.01.2015 | 14:15

Topology-Seminar-Configuration Spaces of Graphs

Ort: Seminar room in the Villa, Arnimallee 2, 14195 Berlin

28.01.2015 | 17:00


Ort: TU Berlin, Audimax, Straße des 17. Juni 135

23.01.2015 | 14:00 c.t. - 16:00
23.01.2015 | 13:00

Improving bistellar simplification

Ort: Seminar room in the Villa, Arnimallee 2, 14195 Berlin

21.01.2015 | 17:00
18.01.2015 - 31.01.2015

Generalized Schur-Horn orbitopes and zonoids

Ort: Seminar Room, Arnimallee 2, FU Berlin

15.01.2015 | 14:15

Eliminating Tverberg Points: An Analogue of the Whitney Trick

Ort: Seminar room in the Villa, Arnimallee 2, 14195 Berlin

14.01.2015 | 17:00

Phirotopes & Almost-Fisher Families

Ort: Freie Universität Berlin, Takustr, 9, 14195 Berlin, room: 005

12.01.2015 | 14:15

Salon des Einstein-Zentrums Mathematik (ECMath)

Ort: Urania Berlin, BMS Lounge, An der Urania 17, 10787 BErlin

09.01.2015 | 16:00

Discrete Geometry Seminar- Victor M.Buchstaber

Ort: Seminar Room, Arnimallee 2, FU Berlin

08.01.2015 | 14:15

The maximum likelihood degree and data discriminants of likelihood equations

Ort: Seminar room in the Villa, Arnimallee 2, 14195 Berlin

07.01.2015 | 17:00

6th polymake workshop

Ort: TU Berlin

05.12.2014 | 09:00
04.12.2014 - 05.12.2014

DGD seminar

 The next talk in the DGD seminar at TU Berlin is on   Tuesday, 28.10.2014 at 14:15 in MA 874   on "Matching centroids by a projective transformation"   Speaker: Ivan Izmestiev   Abstract:   Let K and L be two subsets of R^d. Does there exist a projective   transformation f such that the centroids of f(K) and f(L) coincide?   We allow each of K and L to be a point, a finite set of points, or a   d-dimensional body, and find in each case a functional whose critical   points correspond to solutions. Under certain assumptions the   transformation f is unique modulo post-composition with affine   transformations.   Connections arise with the algebraic polarity, Moebius centering of   polytopes, Santalo points, and Hilbert geometry.   The talk is based on the arxiv preprint 1409.6176.

Ort: TU Berlin, MA 874

28.10.2014 | 14:15

ICM 2014

Ort: Seoul, Korea

13.08.2014 - 21.08.2014

Dürer Lecture in New York

Vor 500 Jahren schuf Albrecht Dürer seine drei berühmten "Meisterstiche", darunter den Kupferstich "MELENCOLIA I". Dieses Jubiläum wurde am 17. Mai 2014 mit einer Konferenz "500 Years of Melancholia in Mathematics" in New York gefeiert. Aus diesem Anlass sprach Günter M. Ziegler, Professor für Diskrete Geometrie an der Freien Universität Berlin, über den Polyeder in der "MELENCOLIA I". Hier sehen Sie eine Voraufzeichnung seines Vortrags mit dem Titel "Three Giants, Five Stars, Some Mistakes: Leonardo, Dürer, Kepler, and their Polyhedra" (auf Englisch).

17.05.2014 - 30.06.2014

"Das Mädchen mit den Taschenrechnern"

Ort: Uni Tübingen, Mathematik, N14

30.01.2014 | 18:15 c.t. - 19:45

"Colors of Math"

Ort: Urania Berlin

27.01.2014 | 20:00 - 22:00

Buchpräsentation in München

Ort: Buchhandlung Rupprecht, Amalienstraße, München

25.11.2013 | 20:00 - 22:00
20.11.2013 | 19:30 - 21:30

Vortrag Tag der Mathematik Hamburg

Günter M. Ziegler: "Who's that girl?" - Bilder aus der Mathematik Sieben Bilder aus der Mathematik präsentiert der Berliner Mathematiker Günter M. Ziegler - und dazu eine fröhliche Spurensuche und bemerkenswerte Geschichten, über die Mutter der Algebra, eine Erfinderin aus Hollywood, das Mädchen mit den Taschenrechnern, die Tänzerin vom Effnerplatz, eine Studentin auf der Demo, und so weiter. (Druckfrisch mehr davon findet sich in Günter M. Zieglers neuem Buch "Mathematik - Das ist doch keine Kunst!") http://www.randomhouse.de/Buch/Mathematik-Das-ist-doch-keine-Kunst/Guenter-M-Ziegler/e435136.rhd

Ort: Universität Hamburg, Bundesstraße 55 (Geomatikum)

09.11.2013 | 15:00 - 16:00

Konstanz: "Mathematik - Das ist doch keine Kunst!"

Ort: Konstanz: Aula der HTWG, Gebäude A.

23.10.2013 | 18:00 s.t - 20:30

Buchpräsentation Göttinger Literaturherbst

Ort: Göttingen, in der Historischen Bibliothek der Paulinerkirche

15.10.2013 | 19:00 - 21:00
07.10.2013 - 09.10.2013