From Newsgroup: sci.math
On 1/22/26 12:40 PM, olcott wrote:
Well-founded proof theoretic semantics where True(L, x)
is anchored in provability from the axioms of formal
system L seems to eliminate the undecidability that
model theoretic semantics encounters when truth is
measured from outside of the formal system in a separate
model.
But GOdel's proof wasn't based on a truth outside the system.
The proof was based outside the system, but only about things actually
in the system.
Your problem is you don't seem to understand the rule of context, and
ignore what is actually being said.
There *IS* no number g that satisfies that relationship that he build IN
PA. There is also no proof in PA of this fact.
THere is also no proof in PA that you can't prove the fact.
THus, your "proof theoretic semanrtics" just don't know what to do about
the statement, it is outside their ability to process, and thus make the system just incomplete in its own reasoning. They can't even say it is
outside its ability, as it just can't show that either.
This is the *FORMAL* epistemology of:
"true on the basis of meaning expressed in language"
Which just can't handle mathematics, as you STILL can't explain how you
get from the meaning of the words:
The sum of the squares of the length of the two sides of a right triange
is equal to the square of the length of the hypotenuse.
So, I guess you aren't talking about the problems people actually want
to handle.
--- Synchronet 3.21a-Linux NewsLink 1.2