[MD] Putnam on Is-Ought and Truth

[Steven Peterson]

Hi Craig,


> [Steve]
>> we also could never derive a
>> new "is" from a set of is-premises alone.
>
> Nothing is easier:
> [P1] Socrates is a man.
> [P2]A man is mortal.
> :. [Conclusion]Socrates is mortal.

Steve:
What is implicit and agreed upon in advance without needing to be
stated is a premise P3 that tells us that such premises like P1 and P2
when taken together ought to make us conclude the sorts of claim that
you have concluded. Without such an additional ought-premise your
conclusion would be unwarranted.

Best,
Steve