Sequential and parallel triangulating algorithms for Elimination Game and new insights on Minimum Degree

1 Elimination Game is a well known algorithm that simulates Gaussian elimination of matrices on graphs, and it computes a triangulation of the input graph. The number of fill edges in the computed triangulation is highly dependent on the order in which Elimination Game processes the vertices, and in general the produced triangulations are neither minimum nor minimal. In order to obtain a triangulation which is close to minimum, the Minimum Degree heuristic is widely used in practice, but until now little was known on the theoretical mechanisms involved. In this paper we show some interesting properties of Elimination Game; in particular that it is able to compute a partial minimal triangulation of the input graph regardless of the order in which the vertices are processed. This results in a new algorithm to compute minimal triangulations that are sandwiched between the input graph and the triangulation resulting from Elimination Game. One of the strengths of the new approach is that i...

• Type: Journal
• Year: 2008
• Where: TCS
• Authors: Anne Berry, Elias Dahlhaus, Pinar Heggernes, Geneviève Simonet
• Keywords: Elimination Game, Input Graph, TCS 2008, Theoretical Computer Science, Triangulation