In this paper,we survey some results on the problem of number of edges in spanning eulerian subgraphs,including its origin and development of research.Two classes of open problems were posed:Determine whether the infimum of the problem of number of edges
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李霄民,王斌,雷澜.超欧拉图生成子图边数问题的综述[J].重庆工商大学学报(自然科学版),2006,(4): LI Xiao-min, WANG Bin, LEI Lan. On the problem of number of edges in spanning eulerian subgraphs[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2006,(4):