00:01
Here we have a syllogism, which we're trying to determine whether or not it's valid or invalid.
00:07
If you get home after curfew, then your mom will not be happy.
00:11
Your mom is happy.
00:13
Therefore, you did not get home after curfew.
00:17
Okay, the first thing i like to do with these is to translate it into symbols to help take away a lot of the ambiguous english.
00:26
So i'm going to take the phrases and let's see.
00:31
I have something about getting home after curfew.
00:37
So i'm going to say a for after.
00:41
You got home after curfew.
00:47
And your mom being happy or not happy.
00:49
I don't like including the knot here.
00:52
I would prefer to use a symbol for that.
00:55
So i am going to do h for happy.
01:03
Okay.
01:04
And then translate it into something that looks more like a syllogism.
01:07
So the first sentence here i have if you get home after curfew.
01:15
So if a, then your mom will be not happy.
01:20
So here's where that knot comes in, not happy...