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A labeling of a graph G is a bijection from E(G) to the set {1,2..., |E(G)|}. A labeling is antimagic if for any distinct vertices x and y, the sum of the labels on edges incident to x is different from the sum of the labels on edges incident to y. We say that a graph is antimagic if it has an antimagic labeling. Hartsfield and Ringel conjectured in 1990 that every graph other than K2 is antimagic...
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