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- From: PL436000@brownvm.brown.edu (Jamie)
- Newsgroups: rec.arts.books,sci.philosophy.tech
- Subject: Re: A note on Modal Logic that has nothing to
- Date: Tue, 22 Dec 1992 17:22:15 EST
- Organization: Brown University - Providence, Rhode Island USA
- Lines: 90
- Message-ID: <1h84e6INNhq@cat.cis.Brown.EDU>
- References: <1gr2fmINNl8s@cat.cis.Brown.EDU> <1992Dec18.015229.18660@husc3.harvard.edu> <1gt01uINNrmn@cat.cis.Brown.EDU> <1992Dec22.163049.18787@husc3.harvard.edu>
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-
- >Posted on 22 Dec 1992 at 16:30:47 by Michael Zeleny
-
- MZ:
- >In fact, I glossed over an important detail in my argument. A language
- >may be semantically closed, in the sense of containing intensional
- >meaning predicates applying to (the senses of) its own expressions, and
- >yet remain consistent.
-
- Well, actually, I would have thought it was fairly obvious that
- a language can do that. So long as it doesn't have TOO many
- of those predicates. For example, a language could contain
- its own truth predicate but not its own falsity predicate.
- (It is a popular misconception that Tarski showed a language
- cannot contain its own truth predicate. Even for smooth,
- stratification-free languages, it is pretty obvious that
- he showed only that none can contain its own FALSITY
- predicate. Even then, of course, only that no language
- with at least the expressive power of arithmetic cannot....)
-
- >J:
- >>A figurative circumlocution, huh? Well, I'll wait until I have
- >>a chance to do my assigned reading before following up on this.
- >
- >No need to wait: chances are that I am merely blabbering. No relation
- >to Hallett's book, anyway. Instead of "figurative circumlocution", you
- >may read "contextually eliminable Benthamian fiction". Same difference.
-
- A Benthamian fiction?
-
- Hmm.
- Let's see. Why Benthamian?
-
- Well, perhaps one Benthamian fiction is "the greatest number."
- Bentham wrote about the greatest happiness of the greatest number,
- right? That MUST have been a fiction. Unless he's a finitist.
-
- >J:
- >>I can't resist adding this before I do my reading:
- >>
- >>It appears that no sentence of the type "We cannot quantify over
- >>everything at once" is true. And yet, it also appears that we
- >>cannot quantify over everything at once.
- >>How odd.
-
- MZ:
- >To cite Church summarizing Frege, "nothing can be said truly of what
- >does not exist."
-
- With the apparent exception: That it does not exist.
-
- >(i) We cannot quantify over everything at once.
- >
- >will come to be analyzed as:
- >
- >(ii) In any language L, the range of each quantifier is limited in
- > virtue of not containing any items of type T.
-
- (I wasn't going to object to the quantification over languages. I
- was going to ask what the range of the SECOND "any" is supposed to be.)
-
- >process. So I claim that the propositions expressed by the sentences of
- >*any* language, are in fact infinite abstract objects.
-
- Explain "any".
-
- >Snicker if you must.
-
- Barely containing it.
-
- >>I am nothing if not a dedicated amateur. Professional, too, but
- >>amateur nonetheless.
- >
- >Well, no one is paying me for this, so I must be a pure amateur.
-
- Bravo.
-
- >J:
- >>One last bit:
- >>I have to agree that the Kripke theory of truth does not ultimately
- >>avoid a Tarskian hierarchy. Kripke himself says something like,
- >>"The ghost of the Tarski hierarchy still haunts us."
-
- MZ:
- >It makes me wonder about the point of it all.
-
- Logic will do that.
- The connections between Lob's theorem and Existentialism have
- been insufficiently explored.
-
- Jamie
-