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 and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, March 26, 2019, 12:15 pm

Duration: 30 minutes

Location: CAB G51

Speaker: Charlotte Knierim

Improved bounds on the multicolor Ramsey number of paths and even cycles

We study the multicolor Ramsey numbers for paths and even cycles, Rk(Pn) and Rk(Cn), which are the smallest integers N such that every coloring of the complete graph KN has a monochromatic copy of Pn or Cn respectively. For a long time, Rk(Pn) has only been known to lie between (k−1+o(1))n and (k+o(1))n. A recent breakthrough by Sárközy and later improvement by Davies, Jenssen and Roberts give an upper bound of (k−1/4+o(1))n. We improve the upper bound to (k−1/2+o(1))n. Our approach uses structural insights in connected graphs without a large matching. This is joint work with Pascal Su.


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