Results 31 to 40 of about 566 (185)
Forbidden induced subgraph characterization of circle graphs within split graphs
, 2020 A graph is circle if its vertices are in correspondence with a family of chords in a circle in such a way that every two distinct vertices are adjacent if and only if the corresponding chords have nonempty intersection.
Safe, Martín D. +3 more
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On coloring digraphs with forbidden induced subgraphs
Journal of Graph Theory, 2022 AbstractWe prove a conjecture by Aboulker, Charbit, and Naserasr by showing that every oriented graph in which the out‐neighborhood of every vertex induces a transitive tournament can be partitioned into two acyclic induced subdigraphs. We prove multiple extensions of this result to larger classes of digraphs defined by a finite list of forbidden ...
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Axioms, 2022 Let H be a class of given graphs. A graph G is said to be H-free if G contains no induced copies of H for any H∈H. In this article, we characterize all connected subgraph pairs {R,S} guranteeing the edge-connectivity of a connected {R,S}-free graph to ...
Junfeng Du, Ziwen Huang, Liming Xiong
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Characterizing path graphs by forbidden induced subgraphs [PDF]
Journal of Graph Theory, 2009 AbstractA path graph is the intersection graph of subpaths of a tree. In 1970, Renz asked for a characterization of path graphs by forbidden induced subgraphs. We answer this question by determining the complete list of graphs that are not path graphs and are minimal with this property. © 2009 Wiley Periodicals, Inc.
Lévêque, Benjamin +2 more
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On Sequential Heuristic Methods for the Maximum Independent Set Problem
Discussiones Mathematicae Graph Theory, 2017 We consider sequential heuristics methods for the Maximum Independent Set (MIS) problem. Three classical algorithms, VO [11], MIN [12], or MAX [6] , are revisited. We combine Algorithm MIN with the α-redundant vertex technique[3].
Lê Ngoc C. +2 more
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Some Variations of Perfect Graphs
Discussiones Mathematicae Graph Theory, 2016 We consider (ψk−γk−1)-perfect graphs, i.e., graphs G for which ψk(H) = γk−1(H) for any induced subgraph H of G, where ψk and γk−1 are the k-path vertex cover number and the distance (k − 1)-domination number, respectively.
Dettlaff Magda +3 more
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Graph Classes Generated by Mycielskians
Discussiones Mathematicae Graph Theory, 2020 In this paper we use the classical notion of weak Mycielskian M′(G) of a graph G and the following sequence: M′0(G) = G, M′1(G) = M′(G), and M′n(G) = M′(M′n−1(G)), to show that if G is a complete graph of order p, then the above sequence is a generator ...
Borowiecki Mieczys law +3 more
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Characterizing heavy subgraph pairs for pancyclicity [PDF]
, 2015 Earlier results originating from Bedrossian’s PhD Thesis focus on characterizing pairs of forbidden subgraphs that imply hamiltonian properties. Instead of forbidding certain induced subgraphs, here we relax the requirements by imposing Ore-type degree ...
Broersma, Hajo; id_orcid +4 more
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Generalizing forbidden induced subgraph characterizations of high throttling numbers [PDF]
Australas. J Comb., 2022 Zero forcing is a process that models the spread of information throughout a graph as white vertices are forced to turn blue using a color change rule. The idea of throttling, introduced in 2013 by Butler and Young, is to optimize the trade-off between the number of initial blue vertices and the time taken to force all vertices to become blue.
Joshua Carlson, Jürgen Kritschgau
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Theory and Applications of GraphsA class G of graphs is called hereditary if it is closed under taking induced subgraphs. We denote by G^{apex} the class of graphs G that contain a vertex v such that G − v is in G.
Jagdeep Singh +2 more
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