最終更新日：2024/08/04
The four color theorem was proven in 1976 by Kenneth Appel and Wolfgang Haken.
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The four color theorem was proven in 1976 by Kenneth Appel and Wolfgang Haken.
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The four color theorem was proven in 1976 by Kenneth Appel and Wolfgang Haken.
The four color theorem was proven in 1976 by Kenneth Appel and Wolfgang Haken.
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