[MD] Putnam on Is-Ought and Truth

[craigerb at comcast.net]

[Horse] 
> P1) If [it is true that] Blackbeard is a pirate 
> And 
> P2) If [it is true that] All pirates are murderers 
> then 
> C1) Blackbeard ought to be a murderer 
> But as not all pirates are murderers P2 is not true so conclusion is false. 

Arggggh, back to Logic 1 with ye, matey. 
A valid argument with 1 true premise & 1 false premise, does not necessarily 
have a false conclusion: 
i)      10 > 5 
ii)       5 > 8 
iii) :. 10 > 8 
Craig