Kenneth Appel
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Kenneth Ira Appel was an American mathematician who in 1976, with colleague Wolfgang Haken at the University of Illinois at Urbana–Champaign, solved the four-color theorem, one of the most famous prob
Appel in 1970
As they had with Donald Gillies' discovery of the largest prime number using ILLIAC II in 1963, the University of Illinois Urbana-Champaign Mathematics department celebrated the discovery of Appel and Haken's computer-aided proof of the Four color theorem by altering their postage meter.
Wolfgang Haken
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Wolfgang Haken was a German American mathematician who specialized in topology, in particular 3-manifolds.
Kenneth Appel
…Kenneth Ira Appel (October 8, 1932 – April 19, 2013) was an American mathematician who in 1976, with colleague Wolfgang Haken at the University of Illinois at Urbana–Champaign, solved the four-color theorem, one of the most famous problems in mathematics. They proved that any…
Haken in 2008
Wolfgang Haken discusses the four-color theorem with Marshall Pangilinan. They are looking at the book 99 Variations on a Proof by Philip Ording.