This is discussed in your textbook in chapter six.

我们讨论的内容在课本第六章

耶鲁公开课 - 聆听音乐课程节选

If there was a time to go too fast it was probably last time, because it turns out this is something that's covered well in the textbook, so it's covered in chapter six of the textbook.

如果真有哪次讲得太快,可能就是上次,因为这些内容,已经在课本上写得很清楚了,就在课本的第六章

耶鲁公开课 - 博弈论课程节选