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

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Waclaw Kusnierczyk <Waclaw.Marcin.Kusnierczyk@xxxxxxxxxxx>
Date: Thu, 31 May 2007 19:24:30 +0200
Message-id: <465F04CE.7050806@xxxxxxxxxxx>

John F. Sowa wrote:
> Since IKL uses the word 'proposition' as a technical term, it is
> important to use that word in a way that minimizes confusion among
> IKL adopters.  I think I agree with Pat about the IKL formalism,
> and I think that I know what he meant by the following statements:
>   1. A proposition has a fixed truth value.
>   2. But a proposition might have different truth values in different
>      contexts.
> However, this conjunction is likely to cause confusion (or at least
> lengthy discussions such as this thread).    (01)

This was one of my major concerns.    (02)

> My recommendation is to replace the above statements with something
> along the following lines:
>   1. The IKL model theory defines an evaluation function Phi, which
>      for any proposition p, determines a truth value Phi(p).
>   2. Inside a nested context, however, the proposition p could have
>      a truth value that is different from the value Phi(p) that would
>      be determined outside any nested context.
> This avoids the word 'fixed' without introducing the word 'changing'
> or any term such as 'proposition-in-a-context'.    (03)

And this looks like a reasonable recommendation.    (04)

vQ    (05)

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