Displaying similar documents to “Heavy cycles in weighted graphs”

A σ₃ type condition for heavy cycles in weighted graphs

Shenggui Zhang, Xueliang Li, Hajo Broersma (2001)

Discussiones Mathematicae Graph Theory

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A weighted graph is a graph in which each edge e is assigned a non-negative number w(e), called the weight of e. The weight of a cycle is the sum of the weights of its edges. The weighted degree d w ( v ) of a vertex v is the sum of the weights of the edges incident with v. In this paper, we prove the following result: Suppose G is a 2-connected weighted graph which satisfies the following conditions: 1. The weighted degree sum of any three independent vertices is at least m; 2. w(xz) = w(yz)...

An Implicit Weighted Degree Condition For Heavy Cycles

Junqing Cai, Hao Li, Wantao Ning (2014)

Discussiones Mathematicae Graph Theory

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For a vertex v in a weighted graph G, idw(v) denotes the implicit weighted degree of v. In this paper, we obtain the following result: Let G be a 2-connected weighted graph which satisfies the following conditions: (a) The implicit weighted degree sum of any three independent vertices is at least t; (b) w(xz) = w(yz) for every vertex z ∈ N(x) ∩ N(y) with xy /∈ E(G); (c) In every triangle T of G, either all edges of T have different weights or all edges of T have the same weight. Then...

On constant-weight TSP-tours

Scott Jones, P. Mark Kayll, Bojan Mohar, Walter D. Wallis (2003)

Discussiones Mathematicae Graph Theory

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Is it possible to label the edges of Kₙ with distinct integer weights so that every Hamilton cycle has the same total weight? We give a local condition characterizing the labellings that witness this question's perhaps surprising affirmative answer. More generally, we address the question that arises when "Hamilton cycle" is replaced by "k-factor" for nonnegative integers k. Such edge-labellings are in correspondence with certain vertex-labellings, and the link allows us to determine...

Constant 2-Labellings And An Application To (R, A, B)-Covering Codes

Sylvain Gravier, Èlise Vandomme (2017)

Discussiones Mathematicae Graph Theory

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We introduce the concept of constant 2-labelling of a vertex-weighted graph and show how it can be used to obtain perfect weighted coverings. Roughly speaking, a constant 2-labelling of a vertex-weighted graph is a black and white colouring of its vertex set which preserves the sum of the weights of black vertices under some automorphisms. We study constant 2-labellings on four types of vertex-weighted cycles. Our results on cycles allow us to determine (r, a, b)-codes in Z2 whenever...

Digraphs are 2-weight choosable.

Khatirinejad, Mahdad, Naserasr, Reza, Newman, Mike, Seamone, Ben, Stevens, Brett (2011)

The Electronic Journal of Combinatorics [electronic only]

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On-line Ramsey theory for bounded degree graphs.

Butterfield, Jane, Grauman, Tracy, Kinnersley, William B., Milans, Kevin G., Stocker, Christopher, West, Douglas B. (2011)

The Electronic Journal of Combinatorics [electronic only]

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Edge cycle extendable graphs

Terry A. McKee (2012)

Discussiones Mathematicae Graph Theory

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A graph is edge cycle extendable if every cycle C that is formed from edges and one chord of a larger cycle C⁺ is also formed from edges and one chord of a cycle C' of length one greater than C with V(C') ⊆ V(C⁺). Edge cycle extendable graphs are characterized by every block being either chordal (every nontriangular cycle has a chord) or chordless (no nontriangular cycle has a chord); equivalently, every chord of a cycle of length five or more has a noncrossing chord.