埃尔德什差异问题让我着迷，因为它陈述起来如此简单，但含义却如此深刻。

In mathematics, the art of proposing a question must be held of higher value than solving it.

It is in the thirties that we want friends. In the forties we know they won't save us any more than love did.

数学是诸神与人类交谈的语言。