具有较小最大度的临界图边数的下界

摘要

运用Discharge法给出了不含2点和3点的6临界图及不含4点和5点的7临界图边数的下界。%Using Discharge method ,the lower bounds for the sizes of edges of 6-critical graphs without 2-vertex and 3-vertex and 7-critical graphs without 4-vertex and 5-vertex are given .