Re: does a table always need a PK?
From: Jan Hidders <jan.hidders_at_pandora.be>
Date: Tue, 26 Aug 2003 23:09:38 GMT
Message-ID: <SMR2b.89152$F92.9700_at_afrodite.telenet-ops.be>
>
> Hmm... 3-valued logic itself is a sound theory, I guess. But I think it is
> computationally too complex and possibly undecidable. If someone at this
> newsgroup knows about the complexity theory of 3-valued logic, please help
> us.
Date: Tue, 26 Aug 2003 23:09:38 GMT
Message-ID: <SMR2b.89152$F92.9700_at_afrodite.telenet-ops.be>
Heikki Tuuri wrote:
>
> "Bob Badour" <bbadour_at_golden.net> kirjoitti viestissä
> news:ZIN2b.963$8o2.85881998_at_mantis.golden.net...
>> >> Are you aware of any sound theory purporting to deal with the problem of >> missing information?
>
> Hmm... 3-valued logic itself is a sound theory, I guess. But I think it is
> computationally too complex and possibly undecidable. If someone at this
> newsgroup knows about the complexity theory of 3-valued logic, please help
> us.
- Jan Hidders