图的交叉数只在好画法中得到，好画法是指满足边自身不交叉，相关联的边不交叉，任意两条交叉的边至多交叉一次的画法。
The crossing number of a graph is the minimum number of pairwise intersections of edges in a drawing of in the plane.
图的交叉数只在好画法中得到，好画法是指满足边自身不交叉，相关联的边不交叉，任意两条交叉的边至多交叉一次的画法。
The crossing number of a graph is the minimum number of pairwise intersections of edges in a drawing of in the plane.
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