Displaying similar documents to “Representation of a finite graph by a set of intervals on the real line”

On the simplex graph operator

Bohdan Zelinka (1998)

Discussiones Mathematicae Graph Theory

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A simplex of a graph G is a subgraph of G which is a complete graph. The simplex graph Simp(G) of G is the graph whose vertex set is the set of all simplices of G and in which two vertices are adjacent if and only if they have a non-empty intersection. The simplex graph operator is the operator which to every graph G assigns its simplex graph Simp(G). The paper studies graphs which are fixed in this operator and gives a partial answer to a problem suggested by E. Prisner.

Simplicial and nonsimplicial complete subgraphs

Terry A. McKee (2011)

Discussiones Mathematicae Graph Theory

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Define a complete subgraph Q to be simplicial in a graph G when Q is contained in exactly one maximal complete subgraph ('maxclique') of G; otherwise, Q is nonsimplicial. Several graph classes-including strong p-Helly graphs and strongly chordal graphs-are shown to have pairs of peculiarly related new characterizations: (i) for every k ≤ 2, a certain property holds for the complete subgraphs that are in k or more maxcliques of G, and (ii) in every induced subgraph H of G, that...

Bipartite intersection graphs

Frank Harary, Jerald A. Kabell, Frederick R. McMorris (1982)

Commentationes Mathematicae Universitatis Carolinae

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Connectivity of path graphs

Martin Knor, L'udovít Niepel (2000)

Discussiones Mathematicae Graph Theory

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We prove a necessary and sufficient condition under which a connected graph has a connected P₃-path graph. Moreover, an analogous condition for connectivity of the Pₖ-path graph of a connected graph which does not contain a cycle of length smaller than k+1 is derived.