Tip:
Highlight text to annotate it
X
Hello there. Nice to see you again. >> VIDEO: Thank you.
>> TEACHER: Alright, go ahead.
>> VIDEO: Okay, I'm going to tell you about complex numbers today.
Complex numbers have a real part and an imaginary part.
You know what? You're making me nervous just standing there.
Could you just go hide somewhere? >> TEACHER: Wait, are you talking to me?
>> VIDEO: Yes, you. Just get out of the way somewhere. I don't want to see, it makes me nervous to have two of us here.
>> TEACHER: What if I hide down here, like this? >> VIDEO: Okay, good. Stay there. Thank you
Okay. As I was saying complex numbers have an imaginary part and a
Hey! I see you there. Go away!
Complex numbers have an imaginary part and a real part
I see it's written over there on the whiteboard.
If you take a real number plus an imaginary number
then you end up with a complex number.
Now the most important thing about complex numbers is if you take an imaginary number like i... [sound cuts off]
>> AUDIENCE: Aww...
>> VIDEO: Hey, what's wrong with the connection?
That last thing I said was really important, Let me rewind it again so you can see it.
So if you take i times i, i squared, you end up with negative one.
So that's true for any of the imaginary numbers,
Because complex numbers are made up [sound cuts off]
Hey! What is this thing?
I don't know what this is, but I don't know why this keeps happening, I'm just gonna get rid of this
And, so it won't happen again,
Let me move this over all the way to there. There we go. Now it won't...
You know what?
Wait a second, here.
Did you start me in Internet Explorer?
What were you thinking? You know what? I gotta start a better browser here.
Let's just see here.
Okay.
Ah, Much better. Okay, now back to complex numbers
they have the imaginary part and a real part
but you know what? This has gotten me thinking
I'm having a bit of a philosophical crisis here.
Maybe you really do need a real teacher. I feel like the imaginary part
>> TEACHER: I'm a real teacher >> VIDEO: Yeah, you know what?
I'm going to have to turn it back over to you, I don't know if I can do this anymore. So...
Okay, back to you. Thanks >> TEACHER: Alright, well thanks anyway.
>> TEACHER: Hey, hey! Excuse me.
>> VIDEO: Oh, sorry, I didn't mean to be a distraction. Sorry about that.
Actually, let me just exit out of this
>> TEACHER: Alright, that's a good idea.
[applause]