Individuals do not act so as to maximize the social welfare.
个人的行为并非以社会福利最大化为目标。
解决复杂问题的关键是提出正确的因果问题。
成功不是拥有的,它是租来的,而且每天都要付租金。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
Every problem in mathematics is a puzzle waiting to be solved, and the joy is in the solving.