### The edge-face coloring of graphs embedded in a surface of characteristic zero

Weifan Wang
<span title="">2009</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/civgv5utqzhu7aj6voo6vc5vx4" style="color: black;">Discrete Mathematics</a> </i> &nbsp;
Let G be a graph embedded in a surface of characteristic zero with maximum degree ∆. The edge-face chromatic number χ e f (G) of G is the least number of colors such that any two adjacent edges, adjacent faces, incident edge and face have different colors. In this paper, we prove that
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