[Top] [All Lists]

Re: [ontolog-forum] Ontology, Information Models and the 'Real World': C

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Ingvar Johansson <ingvar.johansson@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 29 May 2007 15:40:09 +0200
Message-id: <465C2D39.5060301@xxxxxxxxxxxxxxxxxxxxxx>
John F. Sowa schrieb:
> Wacek and Ken,
> vQ> This encourages me to ask another question:  do propositions
>  > involve indexicals?  (Would there be proposition-indexicals?)
>  > Does the statement 'he is wise' correspond to a (number of)
>  > proposition(s) about a particular individual at a particular
>  > time each, or can it correspond to a proposition which still
>  > does not have the 'he'-part resolved?
> KC> I think it's hard to consider any meaning of a proposition
>  > like that without considering that it has an intended referent
>  > for the indexical - that is, that it refers to a particular
>  > individual.
> I agree with Ken.
>       (01)

So do I, but this means that there is some distinction to be made (at 
least) in relation to indexical sentences. I have once proposed that in 
relation to a sentence such as 'he is wise' one should distinguish 
between a 'sentence mening' and a 'used sentence meaning'. Only used 
sentence meanings can express propositions and have truth-values, but of 
course there is something that corresponds to a non-indexed 'he is 
wise', too. (The idea is to be found in section 1 of my paper 
"Performatives and Antiperformatives", which is linked to my home site 
section 5. However, I am not the first one to have proposed such a 
distinction. David Lewis has made practically the same distinction in 
terms of 'sentence meaning' and 'sentence meaning at an index', see 
'General Semantics', Synthese 1970.)    (02)

Let me now apply this line of thought to the following quotation from vQ:
"The question, again, is about propositions. The sentence "no roses are 
blue" was true some time ago, and is false now; but does it correspond 
to the same proposition in both cases? Is it the proposition that 
changed its truth value, or are we really dealing with two distinct 
propositions: 'no roses are blue at t1', and 'no roses are blue at t2'?"    (03)

I would say that there is only one *sentence meaning* "no roses are 
blue", but two *used sentence meanings* and two propositions, one which 
is true and one which is false. Propositions cannot change truth-values.    (04)

Ingvar    (05)

Message Archives: http://ontolog.cim3.net/forum/ontolog-forum/  
Subscribe/Config: http://ontolog.cim3.net/mailman/listinfo/ontolog-forum/  
Unsubscribe: mailto:ontolog-forum-leave@xxxxxxxxxxxxxxxx
Shared Files: http://ontolog.cim3.net/file/
Community Wiki: http://ontolog.cim3.net/wiki/ 
To Post: mailto:ontolog-forum@xxxxxxxxxxxxxxxx    (06)

<Prev in Thread] Current Thread [Next in Thread>