Notation: so I'm going to use little "si" to be a particular strategy of Player i.

表述法,我们用小写si来表示参与人i的某个策略

耶鲁公开课 - 博弈论课程节选

Now I need to distinguish this from the set of possible strategies of Player I, so I'm going to use capital "Si" to be what?

我们需要把这个特定的策略和,参与人i的可能策略集合区别开来,我们用大写的Si来表示什么

耶鲁公开课 - 博弈论课程节选