The Friday Seminar is an informal weekly seminar for

• members of discrete mathematics group
• students in the group
• everybody else that is interested

Every week there is one speaker that gives a talk of one of the following kind

• presentation of original research
• introduction into an open problem that he/she currently works on
• presentation of proposed plan for bachelor, master, diploma or PhD thesis
• presentation of results from bachelor, master, diploma or PhD thesis
• presentation of research paper that might be of interest for the group

The seminar takes place in seminar room 3.060 in the new (old) math building 20.30.

UPCOMING TALK

Friday July 17, 14:00

Maria Axenovich

Report from Ron Graham's Birthday Conference

Ron Graham's 80th birthday conference took place in Vancouver this June with almost 200 participants from all over the world. In this talk I will discuss some new results presented there.

Talk History

• 2015/07/10 -- Stefan Walzer -- Finding Monochromatic Cubes in Coloured Cubes
• 2015/07/03 -- Jonathan Rollin -- Degrees and Factors in Graphs
• 2015/06/26 -- Stefan Walzer -- Secure Card-Based Computation
• 2015/06/19 -- Jonathan Klawitter -- Crossing Minimisation in Book Embeddings
• 2015/06/12 -- Stephen G. Kobourov -- 1-Planar Graphs

• 2015/06/05 -- Maria Axenovich -- Hales-Jewett Theorem and Ramsey Classes
• 2015/05/29 -- Peter Stumpf -- On Covering Numbers of Different Kinds
• 2015/05/22 -- Sebastian Ziesche -- A Short Introduction to Percolation
• 2015/05/15 -- Torsten Ueckerdt -- The Etiquette of Sharing a Cake
• 2015/05/08 -- Alexander Koch and Stefan Walzer -- TikZ vs. Ipe

• 2015/04/24 -- Felix Joos -- An Approximation of the Packing-Covering Duality
• 2015/04/17 -- Torsten Ueckerdt -- Combinatorial Graph Sharing Games
• 2015/02/06 -- Stefan Walzer -- 2-Dimension and Ramsey Lattices
• 2015/01/30 -- Maria Axenovich -- Size Anti-Ramsey Numbers
• 2015/01/23 -- Jonathan Rollin -- Ramsey Equivalent Graphs

• 2015/01/16 -- Torsten Ueckerdt -- Contact Representations of Sparse Planar Graphs
• 2015/01/09 -- Dirk Tröndle -- Convex Distance Function Delaunay Triangulations
• 2014/12/19 -- Valentin Braun -- On-line Graph Colorings
• 2014/12/12 -- Anika Kaufmann -- On Clumsy Packing of Complete Graphs
• 2014/12/05 -- Jennifer Weidelich -- Adjacent Vertex Distinguishing Colorings of Bipartite Graphs

• 2014/11/28 -- Pascal Weiner -- H-free Colourings of Planar Graphs
• 2014/11/21 -- Stefan Walzer -- On the Size of Sumsets
• 2014/11/14 -- Jonathan Klawitter -- Transforming Rectangles Into Squares
• 2014/10/31 -- Jonathan Rollin -- Brooks Type Results for Conflict-Free Colorings and -Factors
• 2014/10/24 -- Torsten Ueckerdt -- Online Coloring Between Two Lines (Folien)

• 2014/07/25 -- Kunal Dutta -- On the Discrepancy of Certain Point-Capturing Hypergraphs
• 2014/07/18 -- Jonathan Rollin -- Conflict-Free Colorings and Factors of Regular Graphs
• 2014/07/11 -- Georg Osang -- The Local Chromatic Number
• 2014/07/04 -- Andre Kündgen -- Spanning Quadrangulations of Triangulated Surfaces
• 2014/06/27 -- Sarah Lutteropp -- On Layered Drawings of Planar Graphs

• 2014/06/13 -- Jennifer Weidelich -- Adjacent Vertex Distinguishing Colorings
• 2014/06/06 -- Jonathan Klawitter -- Transforming Rectangles Into Squares
• 2014/05/30 -- Stefan Walzer -- Disjoint Induced Subgraphs of the Same Order and Size
• 2014/05/23 -- Pascal Weiner -- Improper Colourings of Graphs
• 2014/05/16 -- Open Discussion -- Sympossium Diskrete Mathematik 2014

• 2014/05/02 -- Peter Stumpf -- Covering Numbers of Different Kinds
• 2014/04/25 -- Anika Kaufmann -- Clumsy Packings of Regular Graphs Into a Complete Graph
• 2014/04/11 -- Piotr Micek -- Lower Bounds for On-Line Graph Colorings
• 2014/02/13 -- Yury Person -- Powers of Hamilton Cycles in Pseudorandom Graphs
• 2014/02/07 -- Sarah Lutteropp -- On Layered Drawings of Planar Graphs

• 2014/01/31 -- Stefan Walzer -- Tron : A Two Player Game on Graphs
• 2014/01/24 -- Annette Karrer -- Simultaneous Embeddings of Outerplanar Graphs
• 2014/01/17 -- Torsten Ueckerdt -- The Density of Fan-Planar Graphs
• 2014/01/10 -- Maria Axenovich -- On Distinguishing Colorings
• 2013/12/20 -- Dirk Tröndle -- Convex Distance Funtion Delaunay Triangulations

• 2013/12/13 -- Fabian Stroh -- Coloring Graphs Using Topological Lemmas
• 2013/12/06 -- Enrica Cherubini -- Coloring Mixed Hypergraphs
• 2013/11/29 -- Jonathan Rollin -- Hamiltonicity in Sparse Graphs With High Chromatic Number
• 2013/11/18 -- Torsten Ueckerdt -- Scattered Sets in Cocomparability Graphs
• 2013/07/19 -- André Kündgen -- Central digraphs

• 2013/02/12 -- Maria Axenovich -- On Ramsey Numbers and Size Ramsey Numbers
• 2013/02/05 -- Torsten Ueckerdt and Maria Axenovich -- Non-crossing Connectors in the Plane and Twins
• 2013/01/29 -- Maria Axenovich -- On a Reconstruction Problem for Sequences
• 2013/01/22 -- Torsten Ueckerdt -- Combinatorial and Geometric Properties of Planar Laman Graphs
• 2013/01/15 -- Jonathan Rollin -- Unique Edge Colorings

• 2012/12/18 -- Fabian Stroh -- Coloring Kneser Graphs
• 2012/12/11 -- Ignaz Rutter -- Research on Stack- and Queue-number of Graphs
• 2012/12/04 -- Torsten Ueckerdt -- Research on Coloring Geometric Hypergraphs
• 2012/11/27 -- Alexander Koch -- Representations of Graphs by Outside Obstacles
• 2012/11/20 -- Daniel Hoske -- Book Embedding with Fixed Page Assignments

• 2012/11/13 -- Maria Axenovich -- On bar-visibility representations of graphs
• 2012/11/06 -- Judith Stumpp -- Online Size Anti-Ramsey Numbers
• 2012/10/30 -- Stefan Walzer -- Clumsy Packings - Wasting Space in Geometric Puzzles
• 2012/10/23 -- Jonathan Rollin -- Report from 4 PCC, Poznan
• 2012/10/16 -- Torsten Ueckerdt -- The Twin Problem