Every planar map is four colorable. Part II: Reducibility

K. Appel; W. Haken; J. Koch

doi:10.1215/ijm/1256049012

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Home > Journals > Illinois J. Math. > Volume 21 > Issue 3 > Article

September 1977 Every planar map is four colorable. Part II: Reducibility

K. Appel, W. Haken, J. Koch

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K. Appel,¹ W. Haken,¹ J. Koch¹
¹University of Illinois, Urbana, Illinois; Wilkes College, Wilkes-Barre, Pennsylvania

Illinois J. Math. 21(3): 491-567 (September 1977). DOI: 10.1215/ijm/1256049012

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Illinois J. Math.

Vol.21 • No. 3 • September 1977

Duke University Press

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K. Appel, W. Haken, J. Koch "Every planar map is four colorable. Part II: Reducibility," Illinois Journal of Mathematics, Illinois J. Math. 21(3), 491-567, (September 1977)

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