On 8/16/2012 12:32 PM, John Clark wrote:
If it's undecidable that means its either false or true but contains no proof, that is to say it's truth can't be demonstrated in a finite number of steps. And Turing proved that there are a infinite number of undecidable statements that you can not know are undecidable.

But there's also a different meaning of undecidable: a statement that can be added as an axiom or it's negation can be added as an axiom, e.g. the continuum hypothesiswithin ZFC.


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