----- Original Message -----
From: "J. van Baardwijk" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, October 04, 2002 4:05 AM
Subject: Re: Intellectual output from the Arab World


> At 21:38 03-10-2002 -0500, The Fool wrote:
>
> > > The authority on this is called "plain and simple logic". If X equals
> > > Y, then -X equals -Y. If X equals Y, then -X does not equal -0.5Y.
> >
> >Wrong.  There are a finite number of values where (-X = -0.5Y) And (X =
> >Y).  0.
>
> Read my statement again, but read it carefully this time. The statement
is
> in fact mathematically correct.

I did, and it might be that substitutions would be helpful. I'm assuming,
for this example, we are dealing with the rules of simple algebra and real
numbers.  Lets chose, as the Fool suggested

X=0
Y=0

That means

-X=0
-Y=0
-0.5Y=0

So lets test your propositions

X=Y
0=0  substituting

true



-X=-Y
0=0 substituting

true

The statement if A then not B is falsified if there exists one example
where both A and B are true.

Dan M.


would be very helpful if you accepted that

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