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

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar Talk Information |

**Date and Time**: Thursday, October 21, 2004, 12:15 pm

**Duration**: This information is not available in the database

**Location**: This information is not available in the database

**Speaker**: Alexander Engström (KTH Stockholm)

Given a graph property, and a graph *G*, one can decide if *G* has
the property by asking questions, "is *(x,y)* an edge of *G*?". If an
algorithm asks the questions in a clever order, it may be able to
decide if *G* has the property without asking about all pairs of
vertices.

On the other hand, for some graph properties, there is no such algorithm. Whatever algorithm one tries, there is a graph which forces the algorithm to ask about all pairs of vertices. Such properties are called evasive.

The most rewarding methods to determine which properties are evasive, are from topological combinatorics. We will survey some of these methods, and talk about current trends and results.

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