On 8/2/2016 11:05 AM, Bruno Marchal wrote:
Not at all. The existence of the computations is an elementary metatheorem about Robinson Arithmetic, and already a theorem of Peano Arithmetic (still less that what is needed to enunciate Church Thesis).
I don't think you can get existence from axioms. Otherwise I could take "unicorns exist" as an axiom and they would.
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