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Degree sum and vertex dominating paths
Abstract:A vertex dominating path in a graph is a path P such that every vertex outside P has a neighbor on P. In 1988 H. Broersma 5] stated a result implying that every n‐vertex k‐connected graph G such that urn:x-wiley:03649024:media:jgt22249:jgt22249-math-0001 contains a vertex dominating path. We provide a short, self‐contained proof of this result and further show that every n‐vertex k‐connected graph such that urn:x-wiley:03649024:media:jgt22249:jgt22249-math-0002 contains a vertex dominating path of length at most urn:x-wiley:03649024:media:jgt22249:jgt22249-math-0003, where T is a minimum dominating set of vertices. An immediate corollary of this result is that every such graph contains a vertex dominating path with length bounded above by a logarithmic function of the order of the graph. To derive this result, we prove that every n‐vertex k‐connected graph with urn:x-wiley:03649024:media:jgt22249:jgt22249-math-0004 contains a path of length at most urn:x-wiley:03649024:media:jgt22249:jgt22249-math-0005, through any set of T vertices where urn:x-wiley:03649024:media:jgt22249:jgt22249-math-0006.
Keywords:degree sum  spanning caterpillar  vertex dominating path
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