数学不是关于数字、方程、计算或算法：它是关于理解的。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
The past is never dead. It's not even past.
We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.
译文：东西长得太快容易早衰，成功来得太突然往往垮得也快。
PAC学习框架提供了一种正式的方法来分析学习算法的效率和有效性。
"You join here not to be cool, but to make others cool."