摘要
首先提出Q图概念,将平面图分为A(Q)和B(Q)两类。
The concept of Q graph is given.A planar graph is divided into A(Q) type and B(Q) type.A(Q) type planar graph is proved to be 4 colourable.
出处
《北京邮电大学学报》
EI
CAS
CSCD
1996年第1期91-94,共4页
Journal of Beijing University of Posts and Telecommunications
关键词
平面图
着色
准色交错路径
Q图
A(Q)类平面图
planar graphs
colouring
quasi colour alternating path
Q graph
A(Q) type planar graph