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Berlin – Poznań seminar on Discrete Mathematics in Hamburg

This joint seminar was founded in the mid 1990ies by Michał Karoński from the Adam Mickiewicz University in Poznań and by Hans Jürgen Prömel (at the time) from Humboldt University of Berlin. The seminar covers selected topics in extremal and probabilistic combinatorics, algorithmic discrete mathematics and related fields and brings together researcher groups from Poland and Germany.


All talks take place at University of Hamburg, Bundesstr. 52, Geomatikum, Room H4.


Friday, May 12, 2023

10:00 – 10:05 opening
10:05 – 11:00 Andrzej Ruciński Erdős – Szekeres type theorems for ordered uniform matchings
11:00 – 11:30 Simón Piga The codegree Turán density of tight cycles minus an edge
11:30 – 12:00 Mariusz Zając Stick breaking games and piercing sequences
12:00 – 12:30 Fabian Hamann Multistage positional games
lunch break
14:00 – 14:45 Olaf Parczyk Graphs with large minimum degree and no small odd cycles are 3-colourable
14:45 – 15:15 Tomasz Kościuszko Counting solutions to invariant equations in dense sets
15:15 – 15:45 Richard Lang Perfect tilings in dense hypergraphs
coffee break in room 241
16:30 – 17:00 Marta Piecyk A parameter related to the size of maximum induced matching in products of graphs
17:00 – 17:30 Marcin Witkowski On the Erdős – Szekeres problem for convex permutations and orthogonally convex point sets
17:30 – 18:30 Christian Reiher The girth Ramsey theorem
19:30 – 17:30 joint dinner at mama trattoria, Am Sandtorkai 50

Saturday, May 13, 2023

08:45 – 09:30 Tibor Szabó New Ramsey multiplicity bounds and search heuristics
09:30 – 10:00 Yannick Mogge Walker-breaker games on random boards
10:00 – 10:30 Joanna Polcyn-Lewandowska Two disjoint cycles in digraphs
coffee break in room 241
11:00 – 11:30 Attila Joó Nash – Williams' intersection conjecture for countable matroids
11:30 – 12:30 Jarosław Grytczuk Squashed cubes and bipartite coverings


  • Yamaan Atwaa (Free University Berlin)
  • Dennis Clemens (Technical University Hamburg-Harburg)
  • Michał Dębski (Warsaw University of Technology)
  • Alberto Espuny Díaz (Ilmenau University of Technology)
  • Sohail Farhangi (Adam Mickiewicz University Poznań)
  • Jarosław Grytczuk (Warsaw University of Technology)
  • Fabian Hamann (Technical University Hamburg-Harburg)
  • Jerzy Jaworski (Adam Mickiewicz University Poznań)
  • Attila Joó (University of Hamburg)
  • Tomasz Kościuszko (Adam Mickiewicz University Poznań)
  • Adam Krupowies (Adam Mickiewicz University Poznań)
  • Richard Lang (University of Hamburg)
  • Dingyuan Liu (Free University Berlin)
  • Zbigniew Lonc (Warsaw University of Technology)
  • Yannick Mogge (Technical University Hamburg-Harburg)
  • Karolina Okrasa (Warsaw University of Technology)
  • Olaf Parczyk (Free University Berlin)
  • Marta Piecyk (Warsaw University of Technology)
  • Simón Piga (University of Birmingham)
  • Joanna Polcyn-Lewandowska (Adam Mickiewicz University Poznań)
  • Silas Rathke (Free University Berlin)
  • Christian Reiher (University of Hamburg)
  • Andrzej Ruciński (Adam Mickiewicz University Poznań)
  • Katarzyna Rybarczyk (Adam Mickiewicz University Poznań)
  • Paweł Rzążewski (Warsaw University of Technology)
  • Mathias Schacht (University of Hamburg)
  • Tibor Szabó (Free University Berlin)
  • Katarzyna Taczała (Adam Mickiewicz University Poznań)
  • Anusch Taraz (Technical University Hamburg-Harburg)
  • Marcin Witkowski (Adam Mickiewicz University Poznań)
  • Mariusz Zając (Warsaw University of Technology)

  Seitenanfang  Impressum 2023-05-14, Mathias Schacht