So this becomes where defining the system and the boundaries and everything becomes important.

因此问题就变成了,如何定义系统和边界,那么一切都变得重要了。

麻省理工公开课 - 热力学与动力学课程节选

So that's the expected return and efficient portfolio frontier problem.

这就是预期收益,和有效边界问题。

耶鲁公开课 - 金融市场课程节选