Every planar map is four colorable:
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Bibliographic Details
Main Authors: Appel, Kenneth I. (Author), Haken, Wolfgang (Author)
Format: Book
Language:English
Published: Providence, RI American Math. Soc. 1989
Series:Contemporary mathematics 98.
Subjects:
Item Description:Literaturangaben
Physical Description:XV, 741 S. graph. Darst.
ISBN:0821851039

There is no print copy available.

Interlibrary loan Place Request Caution: Not in THWS collection!