Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger, D. Steurer and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Thursday, May 05, 2022, 12:15 pm

Duration: 30 minutes

Location: CAB G51

Speaker: Miloš Trujić

On the size-Ramsey number of grids

For a positive integer s, the s x s grid is a graph with vertex set [s] x [s] and two pairs being adjacent if and only if they differ by one in exactly one coordinate. As grids have certain structural parameters unbounded but are rather simple (bounded degree, bipartite) they serve as an interesting example for developing new techniques in studying size-Ramsey numbers. The size-Ramsey number of a graph H is defined as the smallest integer m for which there exists a graph on m vertices such that every two-colouring of its edges contains a monochromatic copy of H. Together with David Conlon and Rajko Nenadov, we recently showed that the size-Ramsey number of an s x s grid is bounded by O(s^{5/2}), significantly improving the previously best known bound and breaking the 'random graph barrier'.

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