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Re: [ontolog-forum] Current Semantic Web Layer pizza (was ckae)

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Wacek Kusnierczyk <Waclaw.Marcin.Kusnierczyk@xxxxxxxxxxx>
Date: Thu, 06 Sep 2007 11:00:12 +0200
Message-id: <46DFC19C.1040207@xxxxxxxxxxx>
Ed Barkmeyer wrote:
> First rule: when discoursing with logicians remember that "all"
> and "always" are reserved words.  ;-)  In logic, "not 100%" is 
> the *opposite* of "all".  A single counterexample is a disproof.
Second rule: 'opposite' is a bit vague, avoid using it unless you're its 
meaning is clear.
'opposite to all' might mean:
- not all (a contradiction)
- none (a contrary)    (01)

as in:
All X are Y is contradiction to Some X are not Y
All X are Y is contrary to No X are Y    (02)

see 'square of opposition' in a dictionary of philosophy, or the like.    (03)

(interestingly, contraries can both be false, but of two contradicting 
statements, one must be false and the other true.)    (04)

vQ    (05)

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