A sign pattern matrix is the matrix whose entries come from the set {+, -, 0). For A is an element of Q(n), there exist the associated digraph D(A) and the associated signed digraph S(A). In this paper, we study the bounds on the base of primitive non-powerful digraphs with two simple ycles. We obtain lower bounds, together with characterization of the equality cases of the base for primitive digraphs.
机构:
Yancheng Teachers Univ, Dept Math, Yancheng 224002, Jiangsu, Peoples R China
East China Normal Univ, Dept Math, Shanghai 200241, Peoples R ChinaYancheng Teachers Univ, Dept Math, Yancheng 224002, Jiangsu, Peoples R China
Yu, Guanglong
Yan, Chao
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Univ Sci & Technol, PLA Nanjing, Dept Math & Phis, Nanjing 211101, Jiangsu, Peoples R ChinaYancheng Teachers Univ, Dept Math, Yancheng 224002, Jiangsu, Peoples R China
机构:
S China Normal Univ, Sch Math Sci, Guangzhou 510631, Guangdong, Peoples R ChinaS China Normal Univ, Sch Math Sci, Guangzhou 510631, Guangdong, Peoples R China
You, Lihua
Shen, Jian
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SW Texas State Univ, Dept Math, San Marcos, TX 78666 USAS China Normal Univ, Sch Math Sci, Guangzhou 510631, Guangdong, Peoples R China