永远不要停止学习;一旦停止,你就会开始落后。
最重要的是永远不要停止提问。
数学是科学的钥匙和门。
The secret of great fortunes without apparent cause is a crime forgotten, for it was properly done.
The interplay between local and global phenomena is a recurring theme in number theory.
The beauty of a structure lies in its logic.