K_3-free is an important property of reduced graphs.In studying supereulerian graphs,estimating edge-number is a very interesting problem.In this paper,one upper bound of edge-number of graphs with K_3-free has been found by the method of edge-transition.
王斌,雷澜.不含三角形图的一个边数性质[J].重庆工商大学学报(自然科学版),2007,(1): WANG Bin, LEI Lan. An edge-number property of graphs with K3-free[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2007,(1):