| Planar Graph Theory and the Four Color Problem (Ⅱ)——Five Color Theorem and Formulation of Four color Problem |
| Received:April 21, 1982 |
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| Abstract: |
| This is the second part of the series of five papers about planar graph theory and the four color problem.It contains the following five sections: §6 Related to the Euler formulal§7 Kempe chains and the five color theorem; §8 Color functions; §9Fundamental formulation of the four color problem; §10 Cubic planar graphs; |
| Citation: |
| DOI:10.3770/j.issn:1000-341X.1984.01.029 |
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