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Neighbor sum distinguishing total colorings via the Combinatorial Nullstellensatz

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Abstract

Let G = (V,E) be a graph and φ be a total coloring of G by using the color set {1, 2, ...,k}. Let f(ν) denote the sum of the color of the vertex ν and the colors of all incident edges of ν. We say that φ is neighbor sum distinguishing if for each edge E(G), f(u) ≠ f(ν). The smallest number k is called the neighbor sum distinguishing total chromatic number, denoted by χ nsd″(G). Pilśniak and Woźniak conjectured that for any graph G with at least two vertices, χ nsd″(G) ⩾ Δ(G) + 3. In this paper, by using the famous Combinatorial Nullstellensatz, we show that χ nsd″(G) ⩾ 2Δ(G)+col(G)−1, where col(G) is the coloring number of G. Moreover, we prove this assertion in its list version.

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Correspondence to GuangHui Wang.

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Ding, L., Wang, G. & Yan, G. Neighbor sum distinguishing total colorings via the Combinatorial Nullstellensatz. Sci. China Math. 57, 1875–1882 (2014). https://doi.org/10.1007/s11425-014-4796-0

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