Chromatic Graph Theory at BiggerBooks.com by Gary Chartrand, Ping Zhang

By Gary Chartrand, Ping Zhang

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Example text

In 1935, Heesch solved one of these problems (Problem 18) dealing with tilings of the plane. One of Heesch’s friends at G¨ ottingen was Ernst Witt (1911–1991), who thought he had solved an even more famous problem: the Four Color Problem. Witt was anxious to show his proof to the famous German mathematician Richard Courant (1888–1972), who later moved to the United States and founded the Courant Institute of Mathematical Sciences. Since Courant was in the process of leaving G¨ottingen for Berlin, Heesch joined Witt to travel with Courant by train in order to describe the proof.

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