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- W2076322499 abstract "We relate two concepts in graph theory and algorithmic complexity, namely the search number and the vertex separation of a graph. Let s(G) denote the search number and vs(G) denote the vertex separation of a connected, undirected graph G. We show that vs(G) ≤ s(G) ≤ vs(G) + 2 and we give a simple transformation from G to G′ such that vs(G′) = s(G). We characterize those trees having a given vertex separation and describe the smallest such trees. We also note that there exist trees for which the difference between search number and vertex separation is indeed 2. We give algorithms that, for any tree T, compute vs(T) in linear time and compute an optimal layout with respect to vertex separation in time O(n log n). Vertex separation has previously been related to progressive black/white pebble demand and has been shown to be identical to a variant of search number, node search number, and to path width, which has been related to gate matrix layout cost. All these properties are known to be computationally intractable. For fixed k, an O(n log2n) algorithm is known which decides whether a graph has path width at most k." @default.
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- W2076322499 date "1994-08-01" @default.
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- W2076322499 title "The Vertex Separation and Search Number of a Graph" @default.
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- W2076322499 doi "https://doi.org/10.1006/inco.1994.1064" @default.
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