令A=[aij]是一个n×n的(0,1)方阵.用r表示A中0元素的个数.给出0≤r≤n时,矩阵A的积和式的上下界.
Let A= [aij] be a n× n matrix with 0, 1 entries and r the number of zeros in matrix A. In this paper,the upper bound and lower bound for the permanent of (0,1)-matrices with 0≤r≤n are obtained.