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童年是我们都曾访问过但不太记得的异国他乡。
一个好的数学家是能看到定理之间类比的人;一个伟大的数学家是能看到类比之间的类比的人。
The whole conviction of my life now rests upon the belief that loneliness, far from being a rare and curious phenomenon, peculiar to myself and to a few other solitary men, is the central and inevitable fact of human existence.
The boundaries which divide Life from Death are at best shadowy and vague. Who shall say where the one ends, and where the other begins?