00:01
Hey, folks, for this question, we'll be writing formal negations of a few, or excuse me, informal negations.
00:08
Yeah, so sentences.
00:09
We'll be writing informal negations of a few statements, and we'll be careful to make sure it's very clear, you know, well, we're not going to cheat.
00:18
We're not just going to put not in front.
00:20
We're going to actually form the proper negation, okay? so, the first one is, all dogs are friendly, and then we're going to name.
00:34
I'll use this symbol here for negation.
00:38
So the negation is going to be, right? so if all dogs are friendly, what's the exact opposite of this? well, in order for all dogs, or in order for not all dogs to be friendly, all we need is one dog is the opposite of friendly would be unfriendly.
00:57
Or i should say at least one dog.
01:06
So maybe one dog, maybe two, maybe all of them are unfriendly.
01:09
But so long as at least one dog is unfriendly, then that's the exact negation of all dogs are friendly.
01:17
Okay, b, all people are happy.
01:19
So this one's going to be similar...