湖南师范大学自然科学学报
湖南師範大學自然科學學報
호남사범대학자연과학학보
ACTA SCIENTIARUM NATURALIUM UNIVERSITATIS NORMALIS HUNANENSIS
2014年
4期
87-91
,共5页
最小斜秩%斜对称矩阵%毛毛虫图的r次幂
最小斜秩%斜對稱矩陣%毛毛蟲圖的r次冪
최소사질%사대칭구진%모모충도적r차멱
minimum skew-rank%skew-symmetric matrix%r-power of caterpillars
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.
圖的最小斜秩問題是確定圖的所有斜對稱矩陣在域F上的秩的最小值.利用構造矩陣和零彊迫集的方法刻畫瞭毛毛蟲圖的r次冪的最小斜秩.設毛毛蟲Tn 有n箇節點,n和r都是正整數,r是奇數,那麽mr-(Trn)=n-r+3, n是偶數,r≤n, n-r+2, n是奇數,r≤n,2, r≥n.噹r為偶數,n為奇數時,n-r+3≤mr-(Trn)≤2n-r+2.特彆地,噹r=2時,n+1≤mr-(T2n)≤2n.且對任意偶數x∈[n+1,2n],都存在一箇毛毛蟲Tn,使得mr-(T2n)=x.
도적최소사질문제시학정도적소유사대칭구진재역F상적질적최소치.이용구조구진화령강박집적방법각화료모모충도적r차멱적최소사질.설모모충Tn 유n개절점,n화r도시정정수,r시기수,나요mr-(Trn)=n-r+3, n시우수,r≤n, n-r+2, n시기수,r≤n,2, r≥n.당r위우수,n위기수시,n-r+3≤mr-(Trn)≤2n-r+2.특별지,당r=2시,n+1≤mr-(T2n)≤2n.차대임의우수x∈[n+1,2n],도존재일개모모충Tn,사득mr-(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.