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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: Sun, 27 May 2007 23:08:33 +0200
Message-id: <4659F351.2010202@xxxxxxxxxxx>
this was my guess, though i was wondering whether you use a different 
definition of 'asymmetric'.    (01)

vQ    (02)

Christopher Menzel wrote:
> On May 27, 2007, at 3:03 AM, Waclaw Kusnierczyk wrote:
>> Pat Hayes wrote:
>>>  take a look
>>>
>>> http://www.ihmc.us:16080/users/phayes/context/ContextMereology.html
>> There, you say:
>>
>> "the parthood relationship, which we will assume is transitive,
>> asymmetric and reflexive"
>>
>> Can you give an example of a relation that is both asymmetric and
>> reflexive (other than the vacuously asymmetric and reflexive empty
>> relation)?
> 
> Clearly he means "antisymmetric", i.e.,
> 
> (if (and (R x y) (R y x))
>      (= x y))
> 
> 
>  
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>      (03)

-- 
Wacek Kusnierczyk    (04)

------------------------------------------------------
Department of Information and Computer Science (IDI)
Norwegian University of Science and Technology (NTNU)
Sem Saelandsv. 7-9
7027 Trondheim
Norway    (05)

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