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echo: philos
to: JOHN BOONE
from: WILLIAM ELLIOT
date: 1998-01-02 05:41:00
subject: Black and White

 >>> John Boone on Black and White 
 WE> The logical connective  
 WE> 'or' has two different senses, inclusive or, and exclusive  
 WE> or.  Exclusive P or Q is P or Q but not both P & Q.   
 JB> 
 JB> Yep, and I was using the exclusive -OR-. 
Logicians use 'xor' to denote exclusive or and 'or' to denote inclusive or.  
So when you use or I assume that you mean inclusive or.  Note that 'P or P' 
but not 'P xor P'.  Also note that P xor Q implies P or Q while the reverse 
is false.
 
 WE> Hence the expression stereotypical 'black and white' thinking. 
 JB> Yep, but binary logic is such a case. 
Not familiar with that term.  Binary data and two value logic are the terms 
I'm familiar with.  Are you familiar with the distinctions of logic, 
schematics, syntactics, semantics?
... UFO - Unduly Fabricated Opinion from inner space.
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