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better test for church numerals
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14
15 set "baseuri" "cic:/matita/test/".
16
17 include "nat/nat.ma".
18
19 axiom A : Type.
20
21 inductive vec : nat -> Type := 
22  | vnil : vec O
23  | vcons : ∀x:A.∀n:nat. vec n -> vec (S n).
24
25 definition f := λx,n.λv:vec n.vcons x n v.
26 definition g := λn,x.λv:vec n.vcons x n v.
27
28 include "logic/equality.ma".
29
30 (* definition xx :=  f = g. *)
31 theorem xx1 : ∀n.∀x1:vec n.f ? ? x1 = g ? ? x1.