Thinking about programs and models

1. Visualization 形象化

   Use the diagram to describe the problems.

   使用形象化的图标描述问题。

2. Physical model 建立物理模型

   Build a physical model in the real-world.
   Advantage:

   • Very clear

   Disadvantages：

   • Can be expensive
   • can be time-consuming to build
   • Requires resources and effort
   • Not every problem can use the physical model

3. Reinstatement of problems 重新定义问题

   Define an equivalent form of the problem.

   将问题转化为另一个等价的问题，他们的结论是一样的。

4. Analogy 类比法

5. Mathematical model

   Advantage:

   • unambiguous(Clear definition)
   • concise(abstract)
   • solutions can be proven to be correct
   • inexpensive

   Disadvantage:

   • may be hard and time-consuming
   • what if your model is oversimplifed/wrong

小总结：

本课较为简单，只有五种建模方式，我们需要在合适的问题下选择合适的建模方式，同时要了解他们的有点和缺点。