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, October 03, 2006, 12:15 pm

Duration: This information is not available in the database

Location: CAB G51

Speaker: Amin Coja-Oghlan (HU Berlin)

Graph Partitioning via Adaptive Spectral Techniques

We study random instances of a general graph partitioning problem: the vertex set of the random input graph G consists of k classes V_1, . . . , V_k, and V_i-V_j-edges are present with probabilities p_{ij} independently. The main result is that with high probability a partition S_1, . . . , S_k of G that coincides with V_1, . . . , V_k on a huge subgraph core(G) can be computed in polynomial time via spectral techniques. The result covers the case of sparse graphs (average degree O(1)) as well as the massive case (average degree #V(G) - O(1)). Furthermore, the spectral algorithm is adaptive in the sense that it does not require any information about the desired partition beyond the number k of classes.

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