世界上发生的任何事情，其意义无非是某些极大或极小值。
I believe in the power of positive energy.
The problem is, if you really believe in a society where those who merit to get to the top, get to the top, you'll also, by implication, and in a far more nasty way, believe in a society where those who deserve to get to the bottom also get to the bottom and stay there. I nother words, your position in life comes to seem not accidental, but merited and deserved. And that makes failure seem much more crushing.
形式化方法的美在于它们能够提供关于系统行为的绝对保证。
成功来自于解决实际问题，而不仅仅是追逐趋势。