Re: [ontolog-forum] Foundation ontology, CYC, and Mapping

[Christopher Menzel <cmenzel@xxxxxxxx>]

On Feb 18, 2010, at 1:43 PM, doug foxvog wrote:
> ...
> Philosophers argued that if every X was always a Y, that this was true in
> all possible worlds -- even those in which Ys and Xs don't exist.    (01)

I'm not quite sure whether your use of the past tense here is significant.  
But, if not, that "every X is a Y" is true if there are no Xs is just basic 
first-order logic.  Perhaps I'm missing something.    (02)

-chris    (03)


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