The Four Colour Theorem
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|MacTutor Math History Archives|
|Linked essay describing work on the theorem from its posing in 1852 through its solution in 1976, with two other web sites and 9 references (books/articles).|
|Levels:||High School (9-12), College|
|Resource Types:||Articles, Bibliographies|
|Math Topics:||Graph Theory, History and Biography|
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