The greatest problem for mathematicians now is probably the Riemann Hypothesis.
A mind needs books as a sword needs a whetstone if it is to keep its edge.
失败是有趣的——它是进步的一部分。你从成功中学不到什么,但从失败中可以学到很多。
我写的是那些绝望的人,那些处于边缘的人,那些别无选择的人。
Forgetting is more powerful than despair.