图的最小斜秩问题是确定图的所有斜对称矩阵在域F上的秩的最小值.利用构造矩阵和零强迫集的方法刻画了毛毛虫图的r次幂的最小斜秩.设毛毛虫Tn 有n个节点,n和r都是正整数,r是奇数,那么mr-(Trn)=n-r+3, n是偶数,r≤n, n-r+2, n是奇数,r≤n,2, r≥n.当r为偶数,n为奇数时,n-r+3≤mr-(Trn)≤2n-r+2.特别地,当r=2时,n+1≤mr-(T2n)≤2n.且对任意偶数x∈[n+1,2n],都存在一个毛毛虫Tn,使得mr-(T2n)=x.
The minimum skew-rank of a simple graph G is the smallest possible rank among all skew-symmet-ric matrices over F.The minimum skew-rank of r-power of caterpillar is characterized by using constructing matri-ces and zero-forcing.Let Tn be a caterpillar, and n, r are all positive integers, r is odd, then mr -( T rn )=n-r+3, n is even r≤n, n-r+2, n is odd,r≤n, 2, r≥n. And n-r+3≤mr -(Trn)≤2n-r+2 for r even, n odd.Particularly, n+1≤mr -(T2n)≤2n.For an even number x∈[ n+1,2n] , there exist a caterpillar Tn , such that mr -( T2n )=x.