Abstract: An edge-coloring of a 2-connected plane graph G is a facial
r-acyclic edge-coloring if every facial cycle C in G is colored with at least
min{|C|, r} colors, in addition, no two face-adjacent edges (consecutive edges
of a facial trail of some face) receive the same color. The minimum number of
colors used in such a coloring of G is denoted by a′
fr(G).
In this paper, we determine tight upper bounds for a′
fr(G).
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