带号图是每条边带有符号(正或负)的简单图.探讨了带号图的秩,刻画了秩为2与3的带号图,以及秩为4的带号二部图.
A signed graph is a simple graph in which every edge has been declared positive or negative. The rank of signed graphs is investigated. Signed graphs of rank 2 and 3 and signed bipartite graphs of rank 4 are characterized.