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

Date and Time: Thursday, February 17, 2005, 12:15 pm

Duration: This information is not available in the database

Location: This information is not available in the database

Speaker: Reto Spöhel

Online graph avoidance games in random graph

Consider the following one-player game on a random graph: Starting with the empty graph on n vertices, the edges of K_n appear one by one uniformly at random, and the player has to color them immediately ('online') either red or blue. Her goal is to avoid creating a monochromatic copy of a fixed forbidden graph F as long as possible. How many edges can she typically color? For a large class of graphs F, in particular for cliques of arbitrary size, we show that the game length exhibits a threshold behaviour as n tends to infinity.

(This is joint work with Martin Marciniszyn and Angelika Steger)

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