1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 include "nat/plus.ma".
17 definition hole : ∀A:Type.A → A ≝ λA.λx.x.
20 ∀P:Type.∀f:P→P→Prop.∀x:P.
21 (λw. ((∀e:P.f x (w x)) = (∀y:P. f x (hole ? y))))
22 (λw:P.hole ? w). (* OK *)
25 ∀P:Type.∀f:P→P→P.∀x,y:P.
26 (λw.(f x (w x) = f x (w y))) (λw:P.hole ? w). (* OK, restringe Rel1 *)
28 axiom foo: (λx,y.(λz. z (x+y) + z x) (λw:nat.hole ? w)) = λx,y.x. (* OK *)
29 axiom foo: (λx,y.(λz. z x + z (x+y)) (λw:nat.hole ? w)) = λx,y.x. (* KO, delift rels only *)
33 axiom foo: (λx,y.(λz. z x + z y) (λw:nat.hole ? w)) = λx,y.x. (* OK *)