Unverified50% confidenceFactExact time
The four color theorem was proved in 1976 by Appel and Haken by reducing the map coloring problem to computer-verified case analysis of approximately 1,936 configurations.
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Long-term
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10/7/2026
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UnverifiedThe four-color theorem was verified by computer-aided proof in 1976.78% similarUnverifiedThe computer-assisted proof of the four-color theorem was first published by Kenneth Appel and Wolfgang Haken in 1976, requiring computer verification of 1,936 irreducible configurations, and is the first important theorem proof in the history of mathematics to essentially depend on a computer77% similarUnverifiedThe computer-assisted proof of the Four Color Theorem was completed in 1976, requiring a computer to exhaustively check 1,936 cases.76% similarUnverifiedThe Four Color Theorem was proposed in 1852 but was not proven until 1976 with the aid of a computer72% similarUnverifiedKempe's erroneous proof of the four-color theorem in 1879 drove the development of graph theory and ultimately led to the computer-assisted proof by Appel and Haken in 197671% similar
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