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Re: [Coq-Club] Optional elim restriction?


Chronological Thread 
  • From: Jacques-Henri Jourdan <jacques-henri.jourdan AT inria.fr>
  • To: coq-club AT inria.fr
  • Subject: Re: [Coq-Club] Optional elim restriction?
  • Date: Thu, 10 Mar 2016 18:09:35 +0100


Le 10/03/2016 17:33, Ralf Jung a écrit :
> So I wonder, would it be possible to add a flag to Coq to disable the
> elim restriction? Would that make sense? It's a little like
> type-in-type, except that it's not actually unsound if not combined with
> classical axioms.

If I remember correctly, this restriction is important to soundness :
because Prop is impredicative, we can build a proof of false from
inhabited T -> T.

-- JH

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