Mittagsseminar (in cooperation with J. Lengler, A. Steger, and D. Steurer)

Date and Time: Monday, July 16, 2012, 12:15 pm

Duration: 30 minutes

Location: OAT S15/S16/S17

Speaker: Jan Foniok (Queen's University)

Ramsey Classes Defined by Forbidden Homomorphisms

I will talk about Ramsey properties of classes of digraphs (or more generally, relational structures) defined by forbidding homomorphisms from a fixed set of digraphs. Cases with infinitely many forbidden structures are of particular interest, especially if the forbidden “obstructions” are all trees or have bounded treewidth. These classes have several interesting applications, in areas such as complexity theory of constraint satisfaction problems.

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