# References for Kenneth Appel

**Books:**

- R Wilson,
*Four Colors Suffice: How the Map Problem Was Solved* (Princeton University Press, Princeton, 2002).

**Articles:**

- K I Appel, Roger C Lyndon: a biographical and personal note, in K I Appel, J G Ratcliffe and P E Schupp (eds.),
*Contributions to group theory, Contemporary Mathematics* **33** (Prividence, 1984), 1-10.
- K I Appel, The Use of the Computer in the Proof of the Four Color Theorem,
*Proc. Amer. Philos. Soc. ***128** (1) (1984), 35-39.
- K I Appel and W Haken, The Nature of Proof: Limits and Opportunities,
*The Two-Year College Mathematics Journal* **12** (2) (1981), 118-119.
- K I Appel and W Haken, The Four Color Proof Suffices,
*The Mathematical Intelligencer* **8** (1) (1986), 10-20.
- Kenneth Appel, mathematician of maps, died on April 19th, aged 80,
*The Economist* (4 May 2013).
- Kenneth Appel, 80; first to use a computer to prove a major math theorem,
*The Boston Globe *(30 April 2013).
- D Brooks, Proving the four-color theorem expanded math's frontiers,
*University of New Hampshire Magazine Online* (Spring 2002).

http://unhmagazine.unh.edu/sp02/mathpioneers.html
- M Kingston, Famed mathematician Ken Appel recalled fondly,
*Fosters.com*.

http://www.fosters.com/apps/pbcs.dll/article?AID=/20130508/GJNEWS_01/130509284
- Obituary: Kenneth I Appel (October 8, 1932 - April 19, 2013),
*Tasker Funeral Service*.

http://www.taskerfh.com/fh/obituaries/obituary.cfm?o_id=2069700&fh_id=12298
- D Overbye, Kenneth I Appel, Mathematician Who Harnessed Computer Power, Dies at 80,
*The New York Times* (28 April 2013).
- R Thomas, An update on the Four Color Theorem,
*Notices Amer. Math. Soc.* **45** (7) (1998), 848-859.
- B Toft, Review: Four Colors Suffice: How the Map Problem Was Solved, by Robin Wilson,
*Notices Amer. Math. Soc.* **51** (2) (2004), 205-207.
- A Ward, Kenneth Appel Dies: Mathematician Ushered Computer Into Everyday Use,
*Newsmax* (30 April 2013).
- M Weil, Kenneth Appel, mathematician who solved four-color map problem, dies at 80,
*The Washington Post* (30 April 2013).