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arxiv: 1409.4054 · v2 · submitted 2014-09-14 · 🧮 math.CO

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Planar graphs without 5-cycles and intersecting triangles are (1,1,0)-colorable

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classification 🧮 math.CO
keywords colorablecycleseverygraphsintersectingplanartriangleswithout
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A $(c_1,c_2,...,c_k)$-coloring of $G$ is a mapping $\varphi:V(G)\mapsto\{1,2,...,k\}$ such that for every $i,1 \leq i \leq k$, $G[V_i]$ has maximum degree at most $c_i$, where $G[V_i]$ denotes the subgraph induced by the vertices colored $i$. Borodin and Raspaud conjecture that every planar graph without $5$-cycles and intersecting triangles is $(0,0,0)$-colorable. We prove in this paper that such graphs are $(1,1,0)$-colorable.

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