Every planar map is four colorable
By: Kenneth Appel, and Wolfgang Haken.
Contributors: Haken, Wolfgang.
Series: Contemporary mathematics,; v. 98; Contemporary mathematics (American Mathematical Society) ;; v. 98.
Publisher: American Mathematical Society
Published: 1989
Place of publication: Providence, R.I
Language: eng
Number of pages: 741
Subjects: Four-color problem.
Other titles: Every planar map is 4 colorable.
Notes: Includes bibliographical references.