This paper discusses some properties of the Self-dualgraph and simple self-dualgraph.
本文论述了自对偶图和简单自对偶图的一些性质。
2
This paper presents a definition of imitative dualgraph of outplane graphs, and proves the structural theorem on outplane graphs by using the nature of imitative dualgraph of outplane graphs.
给出了外平面图的拟对偶图的定义,并利用拟对偶图的性质证明了外平面图的结构定理。
3
The interdependent relationship between the Hamiltonian cycle and 4-colouring of the planar graph in the dual have discussed.