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A note on the neighbor sum distinguishing total coloring of planar graphs. (English) Zbl 1345.05035
Summary: Let $$G = (V(G), E(G))$$ be a graph and $$\phi$$ be a proper total $$k$$-coloring of $$G$$. Let $$f(v)$$ denote the sum of the color on a vertex $$v$$ and colors on all the edges incident with $$v$$. $$\phi$$ is neighbor sum distinguishing if $$f(u) \neq f(v)$$ for each edge $$u v \in E(G)$$. The smallest integer $$k$$ for which such a coloring of $$G$$ exists is the neighbor sum distinguishing total chromatic number and denoted by $$\chi_{\Sigma}^{\prime\prime}(G)$$. M. Pilśniak and M. Woźniak [Graphs Comb. 31, No. 3, 771–782 (2015; Zbl 1312.05054)] conjectured that for any simple graph with maximum degree $$\Delta(G)$$, $$\chi_{\Sigma}^{\prime\prime}(G) \leq \Delta(G) + 3$$. It is known that for any simple planar graph, $$\chi_{\Sigma}^{\prime\prime}(G) \leq \max \{\Delta(G) + 3, 14 \}$$ and $$\chi_{\Sigma}^{\prime\prime}(G) \leq \max \{\Delta(G) + 2, 16 \}$$. In this paper, by using the famous Combinatorial Nullstellensatz, we show that for any simple planar graph, $$\chi_{\Sigma}^{\prime\prime}(G) \leq \max \{\Delta(G) + 2, 14 \}$$. The bound $$\Delta(G) + 2$$ is sharp.

##### MSC:
 05C15 Coloring of graphs and hypergraphs 05C10 Planar graphs; geometric and topological aspects of graph theory
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