Re: compound propositions
Date: Tue, 16 Mar 2010 13:15:10 -0700 (PDT)
Message-ID: <8855d600-49b7-45e0-a916-a7e73d0af604_at_g26g2000yqn.googlegroups.com>
On Mar 16, 7:12 pm, paul c <toledobythe..._at_oohay.ac> wrote:
> Must admit I've never understood what is the important difference
> between a tuple and an entity, other than that some people would rather
> talk about entities instead of tuples.
> So in somebody else's vernacular
> maybe I am assuming an 'entity point of view', but that choice of term
> doesn't seem significant to me.
> (I'm not even sure that talking about
> tuples matters as far as the user or programming interface is concerned,
> eg., when talking only about the logical theory it matters but
> probably not at other times.)
>
> If those relations were 'exclusive', I think the proposition would be
> something like ( 'C1' is a customer and 'C1' is not a client ) OR ( 'C1'
> is not a customer and 'C1' is a client ).
I'm sorry, I don't follow. Would you mind rephrasing, please? Received on Tue Mar 16 2010 - 21:15:10 CET