The purpose of a model is to be simple enough to understand and use, but complex enough to capture the essential features of the system.
模型的目的是足够简单以便理解和使用,但又足够复杂以捕捉系统的基本特征。
I find inspiration in nature and mythology.
历史上的每位暴君都相信自由——他自己的自由。
Mathematics is the poetry of logical ideas.