学习数学的唯一方法就是做数学。
NP完全性的概念为理解问题的复杂性提供了一个强大的工具。
When you are young, you think you will be happy when you are older. But then you get older and you realize you were happy when you were young.
贫穷的时候最能表现出一个人是否清廉,富裕的时候最能表现出一个人是否讲求仁义。
The instinct to fear risk forces the poor to take bigger risks.
决定你生活中的主要明确目标,然后围绕它组织你所有的活动。