Non-induced inherent graphs
Vladimir Gurvich, Matjaž Krnc, Martin Milanič, Mikhail Vyalyi
Concepts of avoidable paths and inherent two-rooted graphs were recently introduced for the case of induced subgraphs. In this paper, we translate this framework to the setting of not necessarily induced (NNI) subgraphs, where the structural constraints, as well as conclusions, are significantly relaxed. We develop a new sufficient condition for inherence, and use it to provide complete characterizations of inherent two-rooted paths and forks. We show that for these families, the obvious necessary condition for inherence from the induced case is sufficient in the NNI setting. To complement these results, we introduce two general methods for proving non-inherence and apply them to demonstrate the non-inherence of several classes of two-rooted trees. Keywords: subgraph, two-rooted graph, two-rooted tree, avoidable two-rooted graph, inherent two-rooted graph
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