混合的DEA模型最优解的存在性

Existence of Optimal Solution to Mixed Model in DEA

有ｎ个决策单元。设被评价的决策单元可以不是这ｎ个之一，且它们的输入或输出可以取负值，在这样情况下。

There are n decision making units (DMU S). Suppose that an evaluated DMU may be not one of n DMU S and their inputs or outputs may be negative. In such a case this paper presents the necessary conditions or sufficient conditions on the existence of optimal solution for mixed model in DEA.