Edge coloring of signed graphs
Discrete Applied Mathematics(2020)
摘要
In this paper, we introduce edge coloring for signed graphs which is naturally corresponding to the vertex coloring of their signed line graphs. Let χ±′(G,σ) denote the edge chromatic number of a signed graph (G,σ). It follows from the definition that χ±′(G,σ)≥Δ, where Δ is the maximum degree of G. We attempt to establish Vizing type of theorem for χ±′(G,σ), and we are able to show that χ±′(G,σ)≤Δ+1 if Δ≤5 or if G is a planar graph. Further, we show that every planar graph with Δ=8 and without adjacent triangles has a linear 4-coloring, which confirm the Planar Linear Arboricity Conjecture for this family of graphs. A direct application of this result shows that χ±′(G,σ)=Δ if G is a planar graph with Δ≥10 or G is a planar graph with Δ∈{8,9} and without adjacent triangles.
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关键词
Edge coloring,Linear arboricity,Signed graph,Planar graph
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