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arxiv: 1610.08849 · v3 · pith:O6G2NFRPnew · submitted 2016-10-27 · 🧮 math.CO · math.NT

Prime Labeling of Ladders

classification 🧮 math.CO math.NT
keywords labelingprimeverticesadjacentconjectureconjectureddistinctgraph
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A prime labeling of a graph with $n$ vertices is a labeling of its vertices with distinct integers from $\{1, 2,\ldots , n\}$ in such a way that the labels of any two adjacent vertices are relatively prime. T. Varkey conjectured that ladder graphs have a prime labeling. We prove this conjecture.

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