History
Most graph labelings trace their origins to labelings presented by Alex Rosa in his 1967 paper. Rosa identified three types of labelings, which he called α-, β-, and ρ-labelings. β-Labelings were later renamed graceful by S.W. Golomb and the name has been popular since.
Read more about this topic: Graph Labeling
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—Gilbert Keith Chesterton (1874–1936)
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