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Old 25th January 2012, 09:43 AM   #385
Complexity
Philosopher
 
Join Date: Nov 2005
Posts: 9,244
Turing machines, algorithms, problems, and the like may not be 'real' in the same way that my cats are real, but they have properties that can be proven (relative to an axiom set and proof mechanism) and they have real-world consequences. They are as real as the natural numbers - indeed, possibly more so.
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