An Approach to a Proof of the Four-colour Problem
Xu Zhi · Beijing Youdian Xueyuan xuebao · 2003
Based on my recent writings about the colouring of a planar graph, this paper first analyzes the causes for the mistakes of A.B.Kempe's proof of the Fourcolour conjecture,then suggests a way to correct them,finally presents a new proof of the Fourcolour conjecture,which is complete and exact.