摘要Let Г(A) be a directed graph of the matrix A of order n. We say that A is weakly irreducible, if every vertex of Г(A) belongs to some circuit of Г(A). A matrix is weakly irreducible iff there exists a permutation matrix P of order n such
6Yue-zhu WU & Yu-cai SU Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240, China,Department of Mathematics, Qufu Normal University, Qufu 273165, China,Department of Mathematics, University of Science and Technology of China, Hefei 230026, China.Highest weight representations of a Lie algebra of Block type[J].Science China Mathematics,2007,50(4):549-560. 被引量：4
9Chunming YUAN Xiao-Shan GAO Key Laboratory of Mathematics Mechanization,Institute of Systems Science,Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,China..A CRITERION FOR TESTING WHETHER A DIFFERENCE IDEAL IS PRIME[J].Journal of Systems Science & Complexity,2009,22(4):627-635.
