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There's no such thing as a free lunch.

  • -- Milton Friedman 弗里德曼

天下没有免费的午餐。

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Philosophy

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For scholars and laymen alike it is not philosophy but active experience in mathematics itself that can alone answer the question: What is mathematics?

对于学者和门外汉来说，只有数学本身的积极经验，而不是哲学，才能回答这个问题:什么是数学?

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Expect everything, I always say, and the unexpected never happens.

我总是说，期待一切，意外永远不会发生。

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