This paper presents a definition of imitative dual graph of outplane graphs, and proves the structural theorem on outplane graphs by using the nature of imitative dual graph 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。
This paper presents a definition of imitative dual graph of outplane graphs, and proves the structural theorem on outplane graphs by using the nature of imitative dual graph 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。
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