What is it?

是什么
We assume that both players were rational.

我们假设参与人都很理性
We assumed that. That's true,

对的没错
but we've kind of been assuming that throughout backward induction.

这个假设与逆向归纳法有关
You're right none of this backward induction

如果没有这个假设那么
would apply so cleanly if we didn't assume that.

这里的逆向归纳法就没那么完美了
What else do I assume?

还有呢
It's hidden actually, I snuck it in.

它是隐藏的条件
We assume the discount factor is a constant, that's true,

我们假设了折损是恒定的
but not just constant but something else.

不仅仅是恒定还有其他
You're on the right lines.

你们的方向没错
They're the same.

他们是相同的