Re: Formal systems that cannot possibly be incomplete except for unknowns and unknowable

olcott <polcott333@gmail.com> wrote:

On 5/5/2025 5:47 AM, Alan Mackenzie wrote:

In comp.theory olcott <polcott333@gmail.com> wrote:

When we define formal systems as a finite list of basic facts and allow
semantic logical entailment as the only rule of inference we have
systems that can express any truth that can be expressed in language.

Also with such systems Undecidability is impossible. The only
incompleteness are things that are unknown or unknowable.

Do you believe in the tooth fairy, too?

Counter-examples to my claim seem to be categorically impossible.

Arrogantly wrong in the extreme.

That you could not find one seems to prove my point.

Follow the details of the proof of Gödel's Incompleteness Theorem, and
apply them to your "system".  That will give you your counter example.

And don't come back with the arrogantly ignorant falsehood that somehow
Gödel's theorem doesn't apply to your "system".  He proved it applies to
any system that you can do anything at all non-trivial with.

[ .... ]

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Copyright 2024 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer

--
Alan Mackenzie (Nuremberg, Germany).