00:00:00
Hello there. Nice to see you again.
>> VIDEO: Thank you.
00:00:03
>> TEACHER: Alright, go ahead.
00:00:05
>> VIDEO: Okay, I'm going to tell you
about complex numbers today.
00:00:09
Complex numbers have a real part
and an imaginary part.
00:00:13
You know what? You're making me nervous
just standing there.
00:00:15
Could you just go hide somewhere?
>> TEACHER: Wait, are you talking to me?
00:00:17
>> 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.
00:00:22
>> TEACHER: What if I hide down here, like this?
>> VIDEO: Okay, good. Stay there. Thank you
00:00:28
Okay. As I was saying
complex numbers have an imaginary part and a
00:00:32
Hey! I see you there. Go away!
00:00:37
Complex numbers have an imaginary part and a real part
00:00:41
I see it's written over there on the whiteboard.
00:00:45
If you take a real number plus an imaginary number
00:00:48
then you end up with a complex number.
00:00:51
Now the most important thing about complex numbers
is if you take an imaginary number like i... [sound cuts off]
00:01:00
>> AUDIENCE: Aww...
00:01:02
>> VIDEO: Hey, what's wrong with the connection?
00:01:04
That last thing I said was really important,
Let me rewind it again so you can see it.
00:01:09
So if you take i times i, i squared,
you end up with negative one.
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So that's true for any of the imaginary numbers,
00:01:18
Because complex numbers are made up
[sound cuts off]
00:01:23
Hey! What is this thing?
00:01:26
I don't know what this is, but I don't know why
this keeps happening, I'm just gonna get rid of this
00:01:31
And, so it won't happen again,
00:01:33
Let me move this over all the way to there.
There we go. Now it won't...
00:01:39
Wait a second, here.
00:01:43
Did you start me in Internet Explorer?
00:01:46
What were you thinking? You know what?
I gotta start a better browser here.
00:01:49
Let's just see here.
00:02:00
Ah, Much better.
Okay, now back to complex numbers
00:02:04
they have the imaginary part and a real part
00:02:08
but you know what?
This has gotten me thinking
00:02:10
I'm having a bit of a philosophical crisis here.
00:02:13
Maybe you really do need a real teacher.
I feel like the imaginary part
00:02:18
>> TEACHER: I'm a real teacher
>> VIDEO: Yeah, you know what?
00:02:20
I'm going to have to turn it back over to you,
I don't know if I can do this anymore. So...
00:02:25
Okay, back to you. Thanks
>> TEACHER: Alright, well thanks anyway.
00:02:37
>> TEACHER: Hey, hey! Excuse me.
00:02:40
>> VIDEO: Oh, sorry, I didn't mean to be
a distraction. Sorry about that.
00:02:44
Actually, let me just exit out of this
00:02:47
>> TEACHER: Alright, that's a good idea.
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