Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.
大脑是用于浇灌观念的商品。
The greatest innovations are often the simplest.
A mathematician is a device for turning coffee into theorems.
我相信每个人都有自己独特的声音,重要的是找到它并勇敢地表达出来。