Contracting a chordal graph to a split graph or a tree

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Contracting a chordal graph to a split graph or a tree

The problems Contractibility and Induced Minor are to test whether a graph G contains a graph H as a contraction or as an induced minor, respectively. We show that these two problems can be solved in |VG|f(|VH|)VGf(VH) time if G is a chordal input graph and H is a split graph or a tree. In contrast, we show that containment relations extending Subgraph Isomorphism can be solved in linear time if G is a chordal input graph and H is an arbitrary graph not part of the input