Every planar map is four colorable /
Main Author: | Appel, Kenneth, 1932-2013 |
---|---|
Other Authors: | Haken, Wolfgang, 1928- |
Format: | Book |
Language: | English |
Published: |
Providence :
American Mathematical Society,
1989.
|
Series: | Contemporary mathematics,
v. 98 CONM ; v. 98 |
Subjects: |
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