necessary conditions

• Full and necessary conditions for reverse of linear transformation
  线性变换可逆的充要条件
• Two sufficient and necessary conditions of solvable finite groups
  有限群可解的两个充要条件
• Sufficient and necessary conditions of multiplicative convex functions
  积性凸函数的充分必要条件
• A necessary condition and a summary for minimum feasible graph
  最小可行图问题的一个必要条件及总结
• Sufficient and necessary conditions for a finite group to be solvable
  有限群可解的若干充分必要条件
• Sufficient and necessary condition about extremum of multi - varible function
  多元函数极值存在的充要条件
• The necessary conditions for minimizers of a kind of nonlinear functions
  一类非线性泛函最小元的必要条件
• Some sufficient and necessary conditions for a finite group to be supersolvable
  有限超可解群的若干充要条件
• Sufficient and necessary conditions for stochastic comparability of jump processes
  跳过程随机可比的充要条件
• The sufficient and necessary conditions of the uniformity of reciprocal matrices
  正互反矩阵一致性的充要条件