(* *)

(* Specifications: *)
Lemma Ext_equiv' : Equivalence Ext'.
Canonical Structure Map_setoid' : Setoid' := Ext_equiv'.
Lemma Ext_equiv'' : Equivalence Ext''.
Canonical Structure Map_setoid'' : Setoid'' := Ext_equiv''.
Lemma Ext_equiv : Equivalence Ext.
Canonical Structure Map_setoid : Setoid := Ext_equiv.