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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: and then... (a curiosity)
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Date: Thu, 4 Sep 2008 22:17:57 +0200
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Date: 2008-09-04T22:18:00+02:00
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On Thu, 4 Sep 2008 21:31:21 +0200, stefan-lucks@see-the.signature wrote:

> On Thu, 4 Sep 2008, Dmitry A. Kazakov wrote:
> 
>> "X/0 > 100 = T" means that neither is possible (contradiction). This
>> "contradiction" is closer to an intuitive understanding of X/0 > 100, yet
>> it is not the standard mathematical meaning of, which is that X/0 > 100 is
>> not a formula at all.
> 
> Well, "X/=0 and Y/X<100" is a common notation with a well-defined meaning, 
> even for X=0 (false, of course). On the other hand an isolated "Y/X<100" 
> only has a well-defined meaning if X/=0.

Hmm, in the texts I can still remember comma was used instead of /\:

   X /= 0, Y/X < 100   (when a set of pairs (X,Y) is specified)

   A, A => B
   --------------     (inference rule)
      B

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de