# olderdates

### Heidelberg Laureate Forum 2016

Location: Heidelberg

### ICME - Öffentlicher Vortrag

Location: Hamburg

### ICME - Plenary Mathematics Lecture

Location: Hamburg

### Mathematics of Jirí Matoušek

Location: Charles University, Prague

### 7th European Congress of Mathematics

Location: TU Berlin

### John von Neumann Lecture 2016

Location: Universität Münster

### DMV & GAMM Jahrestagung

Location: TU Braunschweig

### Panorama der Mathematik, III: Über Fehler

Location: Urania Berlin

### DFG-Vortragsreihe "exkurs - Einblick in die Welt der Wissenschaft"

Location: Wissenschaftszentrum Bonn

### Borel Seminar

Location: Les Diablerets, Switzerland

### “Combinatorics: Challenges and Applications” (Noga Alon 60 birthday)

Location: Tel Aviv University

### Adventsbilder - Ist Mathematik doch eine Kunst?

Location: Urania Berlin

### Panorama der Mathematik, II: Was gibts Neues in der Mathematik?

Location: Urania Berlin

### 7. Thüringer Geometrietag

Location: Friedrich-Schiller-Universität, Jena

### Discrete Geometry Seminar - Moritz Schmitt

Location: Seminar Room, Arnimallee 2, FU Berlin

### Discrete Geometry Seminar - Michal Lason

Location: Seminar Room, Arnimallee 2, FU Berlin

### Discrete Geometry Seminar - Alexander Engström

Location: Seminar Room, Arnimallee 2, FU Berlin

### 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.

Location: Veszprém, Hungary

### Tsukerman - Circumcenter of mass

Location: Seminar Room, Arnimallee 2, FU Berlin

### Lange Nacht der Wissenschaften

Location: Arnimallee 6, FU Berlin

### "What is ... group homology?" -- Peter Patzt (FU)

Location: @BMS Loft Urania

### Discrete Geometry Seminar- Samuel Fionrini

Location: Seminar Room, Arnimallee 2, FU Berlin

### Dressing code for the sphere - scribability problems of polytopes - Chen

Location: Seminar Room, Arnimallee 2, FU Berlin

### 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.

Location: @TU MA 041

### "What is ... a supercritical percolation cluster?" -- Nguyen Tuan Anh

Location: @TU MA 212

### The freeness of ideal subarrangements of Weyl arrangements - Torsten-Hoge

Location: Seminar Room, Arnimallee 2, FU Berlin

### A decomposition theory for vertex enumeration of convex polyhedra -- Leen Stougie

Location: @TU MA 041

### Hodge theory and combinatorics - Adiprasito

Location: Seminar Room, Arnimallee 2, FU Berlin

### ECMath Salon - Randbedingungen erfolgreicher Forschung

Location: Urania Berlin, BMS Lounge

### Seminar-Zero Sets of Polynomials Invariant under Finite Reflection Groups- Tobias Friedl

Location: Seminar Room, Arnimallee 2, FU Berlin

### Contact Representations of Planar Graphs -- Stefan Felsner

Location: @TU MA 041

### ERC Workshop "SD-Models"

Location: FU Berlin

### BMS Days - Berlin People, Projects, Opportunities

Location: BMS Loft in Urania

### Flag Vector Spaces of Polytopes, Spheres and Eulerian Lattices

Location: Seminar Room, Arnimallee 2, FU Berlin

### "What is ... (algebraic) complexity theory?" -- Jesko Hüttenhain (TU)

Location: BMS Loft in Urania

### Valuations on Lattice Polytopes

Location: @TU MA 041

### Moduli of Tropical Plane Curves- Sarah Brodsky

Location: Seminar Room, Arnimallee 2, FU Berlin

### Topology-Seminar-Configuration Spaces of Graphs

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

### What can be computed in algebraic geometry? -- Wolfram Decker

Location: @TU MA 041

### Preisverleihung

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

### "What is ... the probabilistic method?"

Location: @BMS Loft in Urania

### Congruence Arguments in the Geometry of Numbers and a General Discrete Minkowksi-type Theorem

Location: Seminar Room, Arnimallee 2, FU Berlin

### Improving bistellar simplification

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

### The 18th Midrasha Mathematicae

Location: Jerusalem

### "What is ... a van Kampen obstruction cocycle" -- Isaac Mabillard (IST Austria)

Location: @TU MA 313

### Generalized Schur-Horn orbitopes and zonoids

Location: Seminar Room, Arnimallee 2, FU Berlin

### Eliminating Tverberg Points: An Analogue of the Whitney Trick

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

### Phirotopes & Almost-Fisher Families

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

### Salon des Einstein-Zentrums Mathematik (ECMath)

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

### "What is ... sparse and redundant representation modeling for image processing?" -- Wang-Q Lim (TU)

Location: @BMS Loft in Urania

### Discrete Geometry Seminar- Victor M.Buchstaber

Location: Seminar Room, Arnimallee 2, FU Berlin

### The maximum likelihood degree and data discriminants of likelihood equations

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

### Geometrietag an der TU Dresden

Location: TU Dresden

### ICM 2014

Location: Seoul, Korea

### ERC Workshop "Delaunay Geometry: Polytopes, Triangulations and Spheres"

Location: FU Berlin/Seminaris Conference Center

### CoMeTa "Combinatorial Methods in Topology and Algebra"

Location: Cortona, Italy

### MDS Workshop "Order and Geometry"

Location: Döllnsee

### MDS Summer School "Order and Geometry"

Location: Döllnsee

### MDS Block Course "High-Dimensional Computational Geometry"

Location: Fu Berlin

### Paul Erdös Centennial Conference

Location: Budapest

### Algebraic Topology and Abelian Functions

Location: Moscow

### 11th Nordic Combinatorial Conference

Location: Stockholm

### "Lange Nacht der Wissenschaften"

Location: FU Berlin

### Euler-Lecture 2013

Location: Castle Theatre, Potsdam-Sanssouci, Neues Palais

### Syzygies in Berlin

Location: ZIB Berlin

### "GMZ 50"

Location: ZIB Berlin

### Simons Lecture "KliMathematik"

Location: FU Berlin, Henry Ford Bau

### "Science Slam" for the Opening Event of the SFB

Location: Tu Berlin, Lichthof