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Date: 22-5-2021
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A coloring of plane regions, link segments, etc., is an assignment of a distinct labeling (which could be a number, letter, color, etc.) to each component. Coloring problems generally involve topological considerations (i.e., they depend on the abstract study of the arrangement of objects), and theorems about colorings, such as the famous four-color theorem, can be extremely difficult to prove.
REFERENCES:
Eppstein, D. "Coloring." https://www.ics.uci.edu/~eppstein/junkyard/color.html.
Saaty, T. L. and Kainen, P. C. The Four-Color Problem: Assaults and Conquest. New York: Dover, 1986.
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