You have to believe in yourself when no one else does.
过去是幽灵,未来是梦,现在只是转瞬即逝的瞬间。
数学不是一项观赏性运动。你必须亲自去做才能理解它。
Systems have sub-systems and sub-systems have sub- systems and so on ad infinitum - which is why we're always starting over.