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Threshold Dimension of Split-permutation Graphs

Carmen Ortiz1, Monica Villanueva2
1Facultad de Ingenieria y Ciencias Universidad Adolfo Ibdéiiez Santiago, Chile
2Ingenieria Informatica Universidad de Santiago de Chile Santiago, Chile

Abstract

The threshold dimension of a graph is the minimum number of threshold subgraphs needed to cover its edges. In this work, we present a new characterization of split-permutation graphs and prove that their threshold dimension is at most two. As a consequence, we obtain a structural characterization of threshold graphs.

Keywords: split graph, permutation graph, threshold graph, thresh- old dimension, certifying algorithms.