Displaying similar documents to “On the number of cycles in k -connected graphs.”

Heavy Subgraph Conditions for Longest Cycles to Be Heavy in Graphs

Binlong Lia, Shenggui Zhang (2016)

Discussiones Mathematicae Graph Theory

Similarity:

Let G be a graph on n vertices. A vertex of G with degree at least n/2 is called a heavy vertex, and a cycle of G which contains all the heavy vertices of G is called a heavy cycle. In this note, we characterize graphs which contain no heavy cycles. For a given graph H, we say that G is H-heavy if every induced subgraph of G isomorphic to H contains two nonadjacent vertices with degree sum at least n. We find all the connected graphs S such that a 2-connected graph G being S-heavy implies...

Large Degree Vertices in Longest Cycles of Graphs, I

Binlong Li, Liming Xiong, Jun Yin (2016)

Discussiones Mathematicae Graph Theory

Similarity:

In this paper, we consider the least integer d such that every longest cycle of a k-connected graph of order n (and of independent number α) contains all vertices of degree at least d.

On hypergraphs of girth five.

Lazebnik, Felix, Verstraëte, Jacques (2003)

The Electronic Journal of Combinatorics [electronic only]

Similarity:

Star-Cycle Factors of Graphs

Yoshimi Egawa, Mikio Kano, Zheng Yan (2014)

Discussiones Mathematicae Graph Theory

Similarity:

A spanning subgraph F of a graph G is called a star-cycle factor of G if each component of F is a star or cycle. Let G be a graph and f : V (G) → {1, 2, 3, . . .} be a function. Let W = {v ∈ V (G) : f(v) = 1}. Under this notation, it was proved by Berge and Las Vergnas that G has a star-cycle factor F with the property that (i) if a component D of F is a star with center v, then degF (v) ≤ f(v), and (ii) if a component D of F is a cycle, then V (D) ⊆ W if and only if iso(G − S) ≤ Σx∈S...

Characterization of semientire graphs with crossing number 2

D. G. Akka, J. K. Bano (2002)

Mathematica Bohemica

Similarity:

The purpose of this paper is to give characterizations of graphs whose vertex-semientire graphs and edge-semientire graphs have crossing number 2. In addition, we establish necessary and sufficient conditions in terms of forbidden subgraphs for vertex-semientire graphs and edge-semientire graphs to have crossing number 2.