数学家是能在定理间找到类比的人;更好的数学家能在理论间看到类比;而最优秀的数学家能注意到类比之间的类比。
A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between theories and the best mathematician can notice analogies between analogies.
言辞是一种行动,我们的词汇是我们用来执行这种行动的工具。
Never a failure, always a lesson.
Quality is never an accident; it is always the result of intelligent effort.