Abstract
Let Δ denote the maximum degree of a graph. Fiamčík first and then Alon et al. again conjectured that every graph is acyclically edge (Δ+2)-colorable. Even for planar graphs, this conjecture remains open. It is known that every triangle-free planar graph is acyclically edge (Δ+5)-colorable. This paper proves that every planar graph without intersecting triangles is acyclically edge (Δ+4)-colorable.
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