The four-color theorem
by Yuriy Brun
Abstract:
In this review paper, I introduce graph theory, and discuss the Four Color Theorem. Then I prove several theorems, including Euler's formula and the Five Color Theorem.
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Citation:
Yuriy Brun, The four-color theorem, Undergraduate Journal of Mathematics, May 2002, pp. 21–28.
Bibtex:
@article{Brun02four-color,
  author = {Yuriy Brun},
  title =
  {\href{http://people.cs.umass.edu/brun/pubs/pubs/Brun02four-color.pdf}{The
  four-color theorem}},
  journal = {Undergraduate Journal of Mathematics},
  venue = {MIT UJM},
  publisher = {{MIT} Department of Mathematics},
  address = {Cambridge, {MA}, {USA}},
  month = {May},
  year = {2002},
  pages = {21--28},

  abstract = {In this review paper, I introduce graph theory, and discuss the
  Four Color Theorem. Then I prove several theorems, including Euler's formula
  and the Five Color Theorem.},
}