Every planar map is four colorable. Part I: Discharging

K. Appel; W. Haken

doi:10.1215/ijm/1256049011

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

September 1977 Every planar map is four colorable. Part I: Discharging

K. Appel, W. Haken

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K. Appel,¹ W. Haken¹
¹University of Illinois, Urbana, Illinois

Illinois J. Math. 21(3): 429-490 (September 1977). DOI: 10.1215/ijm/1256049011

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Illinois J. Math.

Vol.21 • No. 3 • September 1977

Duke University Press

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K. Appel, W. Haken "Every planar map is four colorable. Part I: Discharging," Illinois Journal of Mathematics, Illinois J. Math. 21(3), 429-490, (September 1977)

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