数学是给不同事物起相同名字的艺术。
Mathematics is the art of giving the same name to different things.
我不在乎那些讨厌我的人,我在乎那些爱我的人。
Let them see that their words can cut you and you'll never be free of the mockery. If they want to give you a name take it, make it your own. Then they can't hurt you with it anymore.
Old minds are like old horses; you must exercise them if you wish to keep them in working order.