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- From: auerbach@ncsu.edu (David D Auerbach)
- Subject: Re: Searle on syntax mirroring semantics
- Message-ID: <auerbach.728056438@news.ncsu.edu>
- Sender: news@ncsu.edu (USENET News System)
- Organization: NCSU
- References: <1993Jan26.121155.24448@sophia.smith.edu>
- Date: Tue, 26 Jan 1993 13:53:58 GMT
- Lines: 26
-
- orourke@sophia.smith.edu (Joseph O'Rourke) writes:
-
- >Can anyone explain this sentence to me? It is on p.203 of "The
- >Rediscovery of the Mind" by John Searle.
-
- > The development of proof theory showed that within certain
- > well-known limits the semantic relations between propositions
- > can be entirely mirrored by the syntactic relations between
- > the sentences that express those propositions.
-
- Well, without the context it just seems like an unnecessarily vague way of
- pointing at the completeness theorem for first-order logic; roughly, that
- the semantic relation of first-order consequence (taken as adequately
- captured by a Frege-Tarski formal semantics) is co-extensive with <name
- your favorite first-order logic derviation system>.
- More vague is the "well-known" limits. He could mean a) that first-order
- logical theoremhood is "only" r.e. and not recursive or b) that full
- second-order logic is not so nice proof theoretically or c) if all of
- arithmetic is somehow "semantic" then (cashing in syntactic as
- axiomatizable) the truths of arithmetic outstrip any correct axiomatization.
- These are mere sketches, and c) is the least plausible reading of Searle's
- remark.
- A more general way of looking at it is that the notion of logical form is
- unexpectedly successful in tracking semantic relations; this restores all
- of Searle's vagueness (in the out of context quote, he said carefully) but
- sounds nicer.
-