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Re: [Coq-Club] Propositional extensionality is inconsistent in Coq


Chronological Thread 
  • From: Pierre Boutillier <pierre.boutillier AT pps.univ-paris-diderot.fr>
  • To: coq-club AT inria.fr
  • Subject: Re: [Coq-Club] Propositional extensionality is inconsistent in Coq
  • Date: Fri, 13 Dec 2013 10:49:50 +0100

My point was : Empty_set -> Empty_set = unit is a crazy thing, doesn't
it ?
So are universal subterms an issue in Type ?

But as Arnaud said, I need to wake up before thinking further :-)


Le vendredi 13 décembre 2013 à 04:20 -0500, Maxime Dénès a écrit :
> Hi Pierre,
>
> I am not sure to see what you mean. The term (fun (x : Empty) => match x
> with end) will still be considered by the current termination checker as
> a subterm of any recursive argument, am I wrong? So the issue does not
> seem specific to Prop.




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