You can go ahead and use that equation, or you could figure it out every time, because if you know the total number of nodes, and you know the angular node number, then you know how many nodes you're going to have left.

你们可以直接用这个方程，或者每次都自己算出来，因为如果你们知道了总的节点数，又知道角向节点数，就知道剩下的节点数是多少。

麻省理工公开课 - 化学原理课程节选

And let me use a big Q to be the total quantity produced-- sorry--the total quantity demanded in the market.

用Q代表总产量,对不起,是市场总需求量

耶鲁公开课 - 博弈论课程节选