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[Coq-Club] Cannot Rewrite Under Lambda


chronological Thread 
  • From: roconnor AT theorem.ca
  • To: Coq Club <coq-club AT pauillac.inria.fr>
  • Subject: [Coq-Club] Cannot Rewrite Under Lambda
  • Date: Wed, 2 Feb 2005 10:08:58 -0500 (EST)
  • List-archive: <http://pauillac.inria.fr/pipermail/coq-club/>

Can anyone provide me with a reference that shows that

forall (T U : Set) (f g : T -> U),
(forall x : T, f x = g x) -> (fun y : T => f y) = (fun y : T => g y)

is not provable in Coq?

Thanks.

-- 
Russell O'Connor                                      <http://r6.ca/>
``All talk about `theft,''' the general counsel of the American Graphophone
Company wrote, ``is the merest claptrap, for there exists no property in
ideas musical, literary or artistic, except as defined by statute.''




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