defining the problem 最重要也是最难的对于OR
mathematical modeling is the cornerstone of OR 数学建模是Operations Research的基石。
intangible(unquantifiable) factors (such as human behavior) must be accounted for in the final decision.
难以理解的 24节
1.1 Operations Research Models
To illustrate this point 为了阐述这一点
2（w+h）<=L
w>=0;h>=0;\Maximize z=wh;
the General OR model canbe organized in the following general format
Maximize or minimize : Objective Function
Subject to : Constraints.
Feasible: If it satisfied all the constraints.
Optimal if Being feasible,it yields the best value of the objective function.
原文：http://www.cnblogs.com/nationality/p/6759084.html