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4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
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15 include "logic/equality.ma".
16 include "sets/setoids.ma".
18 ninductive nat: Type[0] ≝
22 ndefinition NAT: setoid.
23 napply mk_setoid [ napply nat | napply EQ]
26 unification hint 0 ((λx,y.True) (carr NAT) nat).