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(* $Id$ *)

(*********************************************************)
(*        Or and Exist in Type                           *)
(*                                                       *)
(*********************************************************)

(**********)
Inductive sumboolT [A,B:Prop]:Type:=
   leftT : A->(sumboolT A B)
  |rightT: B->(sumboolT A B).

(**********)
Inductive sumorT [A:Type;B:Prop]:Type:=
   inleftT : A->(sumorT A B)
  |inrightT: B->(sumorT A B).

(**********)
Inductive sigT [A:Set;P:A->Prop]:Type:=
   existT: (x:A)(P x)->(sigT A P).

(**********)
Inductive sigTT [A:Type;P:A->Prop]:Type:=
   existTT: (x:A)(P x)->(sigTT A P).