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Miles Sabin scripsit:

> Believe what you like ... arithmetic is undecidable, so extending a DL 
> with arithmetic gets you an undecidable system.

Well, we could extend it with real numbers, which trades off representability
for decidability.  :-)

-- 
John Cowan                                jcowan@r...
At times of peril or dubitation,          http://www.ccil.org/~cowan
Perform swift circular ambulation,        http://www.reutershealth.com
With loud and high-pitched ululation.

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