Mathematics is the art of giving the same name to different things.

制革厂的废物流比任何使命宣言都更清晰地讲述其道德故事。

A picture must be a thing in itself, not a representation of something else.

A good mathematician should be both rigorous and imaginative.

自我不是现成的东西，而是通过行动选择不断形成的东西。