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The interplay between discrete and continuous mathematics is where some of the most interesting problems lie.
The old believe everything; the middle-aged suspect everything; the young know everything.
"Books, which we mistake for consolation, only add depth to our sorrow."
人类是一种非常奇特的生物。他认为自己有一个灵魂,但他就是一个灵魂;他有一个身体。