摘要
设A是一个具有周期p的n×n不可约布尔矩阵,文[1]定义了矩阵的广义最大密度指数hA(k)令DISn,d(k)={hA(k)| A PMn(d)},其中PMn(d)是所有恰含d个非零对角元的n×n本原矩阵的集合.本文证明了另外,我们定义矩阵A的范数,用A表示,为A中1的个数,并且刻划了具有最小范数的极矩阵.
Let A be an n x n irreducible Boolean matrix with period p. In [1], the generalized maximum density index hA(k) is defined. Let DISn,d(k) = {hA(k) | A PMn(d)}, where PMn(d) is the set of all n x n primitive matrices with d nonzero entries exactly. In this paper, we show that Furthermore, we define the norm of A, denoted by (A), the numbers of 1 in A and describe the extremal matrices with minimum norm.
出处
《数学学报(中文版)》
SCIE
CSCD
北大核心
2001年第1期15-20,共6页
Acta Mathematica Sinica:Chinese Series
基金
国家自然科学基金
江苏省自然科学基金