Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法：它是关于理解的。
The best investment you can make is in your team.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
It's simple, you just take something and do something to it, and then do something else.