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The night is a world lit by itself.
I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.
头脑可以断言任何事情,并假装已经证明了它。
一本好书是一个永远不会让你失望的朋友。
In order to achieve independence, we must rely on our own strength.