上次我们看了，怎样利用拉格朗日算子，去求解一个受约束的，多变量函数的最大最小值。
OK, so last time we saw how to use Lagrange multipliers to find the minimum or maximum of a function of several variables when the variables are not independent.
讨论了半序集和半序拓扑空间中保序集值算子的最小与最大不动点的存在性。
The existence of the minimal and maximal fixed points for order preserving set-valued operators on semi-ordered sets and semi-ordered topological spaces was analyzed.
证明了抽象空间中一类T 单调算子的最大、最小不动点定理，改进了已知文献的结果。
The maximal and minimal fixed points theorems for a class of T monotone operators in abstract spaces are proved, and some well known results are improved.
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