00:01
We need to choose the appropriate negation of the proposition, the dog is barking.
00:09
We have been given four options here.
00:15
So we're looking for a negation.
00:18
So if this proposition is, say, p, we are looking for not p, sometimes written as tilde p.
00:29
Okay, so we're looking for something, basically, that has the opposite truth value.
00:34
Opposite truth value.
00:35
And this cannot be something where it requires interpretation.
00:39
It needs to be something very clear.
00:41
So let's start with a.
00:42
Dog always barks.
00:44
This does not have the opposite truth value.
00:46
The dog is barking.
00:47
The dog always barks.
00:48
Those could both be true.
00:50
That would be fine.
00:50
So no.
00:52
So it does not have the opposite truth value...