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单词 pathwidth
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Examples ofpathwidth

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The class of graphs withpathwidthat most one requires two excluded minors.
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Therefore, the degeneracy is at most equal to the treewidth and at most equal to thepathwidth.
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Planar graphs that can be partitioned into nested cycles, and planar graphs of boundedpathwidth, have universal point sets of nearly-linear size.
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In particular the maximal graphs ofpathwidthone are exactly the caterpillar trees.
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For earlier approximation algorithms forpathwidth, see and.
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A maximalpathwidth- "k" graph must be either a "k" -path or a "k" -caterpillar, two special kinds of "k" -tree.
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The graphs with such drawings havepathwidththat is bounded by a function of "h" and "k".
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Additionally, for several special classes of graphs, such as trees, thepathwidthmay be computed in polynomial time without dependence on "k".
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Since path-decompositions are a special case of tree-decompositions, thepathwidthof any graph is greater than or equal to its treewidth.
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Many problems in graph algorithms may be solved efficiently on graphs of boundedpathwidth, by using dynamic programming on a path-decomposition of the graph.
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However, the best known lower bound on thepathwidthof cubic graphs is smaller, 0.082 "n".
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Alternatively, thepathwidthmay be defined from interval graphs analogously to the definition of treewidth from chordal graphs.
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If this evader is invisible to the pursuers then the problem is equivalent to finding thepathwidthor vertex separation.
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Another parameter, the graph bandwidth, has an analogous definition from proper interval graphs, and is at least as large as thepathwidth.
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The complexity of a vortex is limited by a parameter called its depth, closely related topathwidth.
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The same dynamic programming method also can be applied to graphs with unboundedpathwidth, leading to algorithms that solve unparametrized graph problems in exponential time.
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Pathwidthand path-decompositions are closely analogous to treewidth and tree decompositions.
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As a consequence, thepathwidthof a graph is always at least as large as its treewidth, but it can only be larger by a logarithmic factor.
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It remains open whether thepathwidthof a planar graph and its dual are always within a constant factor of each other in the remaining cases.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.

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更新时间:2024/12/27 9:56:00