(no subject)
Jan. 31st, 2006 06:14 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
aryanhwyWalter Burley (c. 1275-1344/5) provides a humorous example of the failure of the chain rule (P -> Q and Q -> R implies P -> R):
1. If I say you are a donkey, I say that you are an animal.
2. If I say that you are an animal, I say something true.
3. If I say you are a donkey, I say something true.
<smirk>
1. If I say you are a donkey, I say that you are an animal.
2. If I say that you are an animal, I say something true.
3. If I say you are a donkey, I say something true.
<smirk>
