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Re: An inconsistency or not?

From: <jos.deroo@agfa.com>
Date: Sun, 3 Apr 2005 14:03:39 +0200
To: Danny Ayers <danny.ayers@gmail.com>
Cc: Chris Purcell <cjp39@cam.ac.uk>, minsu@etri.re.kr, semantic-web@w3.org
Message-ID: <OF71D7D489.E539B065-ONC1256FD8.0041D6BC-C1256FD8.00423FEB@agfa.com>
Hi, Danny - excellent idea to explain proofs :)

-- 
Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/




Danny Ayers <danny.ayers@gmail.com>
Sent by: semantic-web-request@w3.org
03/04/2005 12:24
Please respond to Danny Ayers

 
        To:     Jos De_Roo/AMDUS/MOR/Agfa-NV/BE/BAYER@AGFA
        cc:     minsu@etri.re.kr, Chris Purcell <cjp39@cam.ac.uk>, semantic-web@w3.org
        Subject:        Re: An inconsistency or not?


On Apr 3, 2005 2:57 AM, jos.deroo@agfa.com <jos.deroo@agfa.com> wrote:
> 
> [...]
> > By the way, one difficult case I encountered in writing OWL inference
> rules
> > is about checking equality among list elements. When you're given a 
list
> of
> > classes or individuals, some elements of the list can actually be
> > equivalent, which affects the reasoning result. For example:
> >
> > A rdf:type owl:Class.
> > A owl:intersectionOf [B,C,D].
> > B owl:equivalentClass D.
> > E owl:intersectionOf [B,C].
> >
> > >From the above sentences, it should be possible to infer that A is
> > equivalent to E, for which I find writing an inference rule to be
> difficult.
> > I'm still working on it.
> 
> indeed, is kind of difficult.. but indeed
> 
> :A owl:intersectionOf (:B :C :D).
> :B owl:equivalentClass :D.
> :E owl:intersectionOf (:B :C).
> 
> entails
> 
> :E owl:equivalentClass :A.
> 
> well, at least we found proof evidence
> http://eulersharp.sourceforge.net/2004/04test/minsuE.n3

Back in the kindergarten, that work by observation - see attached. 
(also http://dannyayers.com/2005/04/intersection3.gif )

Cheers,
Danny.


-- 

http://dannyayers.com




intersection3.gif
(image/gif attachment: intersection3.gif)

Received on Sunday, 3 April 2005 12:58:13 UTC

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