Okay. So, you talked about rationality,

you need a performance measure,

and then when you have a performance measure,

you can actually optimize the expected value of

performance and choose actions accordingly.

And there's of course the question,

what does rationality leave you into?

And it turns out that a couple of things you

might expect from the mere definitions actually don't obtain.

So, we only need to maximize the expected value,

which means you don't have to know everything,

which you would have to know if you

wanted to, would have to know

if you were to optimize the actual success.

You want to optimize the actual success,

you can only do that if you know the lottery number of next week.

I don't, you probably also don't,

because you would probably not be sitting here.

So, you don't have to be omniscient.

You also don't have to be clairvoyant,

which means your perception apparatus might be faulty.

You can still optimize the expected value,

modulo your faulty sensors.

You have to be as good as you can be,

given your sensors and so on.

But you don't have to do better.

You can get around these clairvoyance or omniscience problems

by doing things like exploration, by studying AI.

Before, you weren't,

you didn't know about AI,

after this course, you do know about AI,

and supposedly that gives you a higher mark on your success scale.

How do I know?

Well, I'm assuming you're all intelligent, thus rational,

and if you weren't expecting that your success would be higher by,

except higher, no, your success, I'm sorry.

Your success is actually being helped by being in the AI course,

and if you didn't think that,

you wouldn't be here because you're rational.

You're doing the stuff that actually optimizes your expected success.

Okay? So, you also have to be autonomous to be rational.

If there are certain things you can't do,

you can't actually be rational.

But to be rational doesn't mean that you're automatically successful.

You're optimizing the expected outcome, not the real one.

If you might be rational to cross the straight,

looking left and right, left again,

even if you take two steps and then you are actually killed

by a satellite that comes plummeting down.

Okay? It's not rational to not cross the street,