So, as I put it, in fact I think I put it this way on the syllabus, participation--and here I mean respectful participation, not hogging the limelight... participation can improve your grade, but it won't lower your grade.

所以，像我这么陈述的，事实上，我想我用这种方式在课程表上，参与，在这里我是指尊重的参与，而不是想出风头的那种。,参与能够加分，而不会使你的分数变少。

耶鲁公开课 - 死亡课程节选

x1 The portfolio mean and variance will depend on x1 x1=1 in the way that if you put--if you made x1 = 1, it would be asset 1 x1=0 and if you made x1 = 0, then it would be the same as asset 2 returns.

投资组合的均值和方差取决于1,如果你令，投资组合的均值方差就与第一项资产相等1,如果你令，那么它们就会与第二项资产的参数相等。

耶鲁公开课 - 金融市场课程节选