在这份报纸,为穿过图的数字的二递归的不平等被使用基本的数给方法。作为他们的应用,十字路口 K 1,3, n 和 K 数 4, n \ e 分别地被决定。
In this paper, two recursive inequalities for crossing numbers of graphs are given by using basic counting method. As their applications, the crossing numbers of K1,3,n and K4,n / e are determined, respectively.