Suppose G is Eulerian graph,X is the subgraph of Gv,in G,the point of X is contracted to a point vxv,if the edges of X are removed,the contraction of subgraph X of G is arrived at and is noted as G/X.The concept of a-subgraph is introduced,a lot of a-subg
李登信.寻找欧拉生成子图最大边数的一个方法[J].重庆工商大学学报(自然科学版),2007,(3): LI Deng-xin. A method to find maximum number of edges in a spanning Eulerian subgraph[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2007,(3):