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Re: [Coq-Club] : is ∀A: Prop, ∼∼(A∨∼A) provable in Coq?


Chronological Thread 
  • From: "Dominique Larchey-Wendling" <dominique.larchey-wendling AT loria.fr>
  • To: <coq-club AT inria.fr>
  • Subject: Re: [Coq-Club] : is ∀A: Prop, ∼∼(A∨∼A) provable in Coq?
  • Date: Thu, 03 Sep 2015 11:33:22 +0200

intro;  tauto.

Dominique

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Le 3 septembre 2015 10:54:33 shengyu shen <shengyushen AT icloud.com> a écrit : Dear all:

I am trying to prove an exercise in coq art “∀A: Prop, ∼∼(A∨∼A).”


I think this may need exclude middle rule, which is not in “Calculus of Inductive Constructions “

am I right?

Shen


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