[FOM] Godel Sentence
Torkel Franzen
torkel at sm.luth.se
Sat Aug 23 12:17:02 EDT 2003
Vladimir Sazonov says:
>It could be said
>that they are intuitively (informally) true.
Exactly as intuitively or informally true as the fundamental theorem
of arithmetic, or any other mathematical theorem.
>Thus, consis(PA) (as formulated in the metatheory PA for PA
>itself) says about *imaginary* proofs in PA of such a length which
>no mathematician can ever write even with the help of powerful
>computers whereas, intuitively, the consistency of PA may be
>considered a very informal statement on feasible proofs, that
>*nobody* can *really* deduce a contradiction in PA.
Exactly as imaginary as large numbers n which the fundamental theorem
of arithmetic states have a unique prime decomposition. There's nothing
special about Gödel's theorem.
>I would rather prefer to tell about
>a correspondence of provable sentences to our intuition and
>external reality, instead of "truth", and this is the real practice
>of mathematics, especially of applied one.
"Correspondence to our intuition and external reality" is a very
doubtful philosophical notion, as opposed to the mathematically
defined "true sentence".
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Torkel Franzen
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