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[Coq-Club] Equality of functions.


chronological Thread 
  • From: Bernard Hurley <bernard AT marcade.biz>
  • To: "coq-club AT inria.fr" <coq-club AT inria.fr>
  • Subject: [Coq-Club] Equality of functions.
  • Date: Wed, 25 Apr 2012 00:47:21 +0100

Hi all,

In the following scenario, is it possible to prove the Lemma?

+++++++++++++++++++++++++++
Section test.
  Variables A B : Set.
  Variables f g : A -> B.

  Hypothesis Hyp1: forall a, f a = g a.

  Lemma test : f = g.

End test. 
+++++++++++++++++++++++++++

The hypothesis is just the normal mathematical definition of the
equality of two functions. But I can't figure out whether it is
reasonable to expect to be able to prove the Lemma or whether one would
need and extra axiom.

Thanks,

Bernard.




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