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Kenneth Appel
Kenneth Appel | |
|---|---|
 Appel in 1970 | |
| Born | Kenneth Ira Appel October 8, 1932 |
| Died | April 19, 2013 (aged 80) |
| Citizenship | American |
| Alma mater | B.S. – Queens College, CUNY Ph.D. – University of Michigan |
| Known for | Proving the Four-color theorem with Wolfgang Haken |
| Children | Andrew Appel[1] Peter H. Appel[1] |
| Awards | Fulkerson Prize [1979] |
| Scientific career | |
| Fields | Graph theory, combinatorics, topology |
| Institutions | University of Illinois at Urbana–Champaign, University of New Hampshire |
| Doctoral advisor | Roger Lyndon |
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 two-dimensional map, with certain limitations, can be filled in with four colors without any adjacent "countries" sharing the same color.
- ^ a b "In Memoriam: Kenneth Appel". math.illinois.edu. Archived from the original on 2021-12-01. Retrieved 2020-09-07.
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