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    Four-color Theorem

    Statement

    The four-color theorem states that any map in a plane can be colored using four colors in such a way that regions sharing a common boundary (other than a single point) do not share the same color.

    Alternate name

    Guthrie's problem

    History

    formulation date | 1852 (172 years ago) formulator | Francis Guthrie status | proved proof date | 1977 (125 years later) (47 years ago) provers | Kenneth Appel | Wolfgang Haken

    Classes

    solved mathematics problems | mathematics theorems

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