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(*         *      The Rocq Prover / The Rocq Development Team           *)
(*  v      *         Copyright INRIA, CNRS and contributors             *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(*   \VV/  **************************************************************)
(*    //   *    This file is distributed under the terms of the         *)
(*         *     GNU Lesser General Public License Version 2.1          *)
(*         *     (see LICENSE file for the text of the license)         *)
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Require Eqdep_dec.
Local Open Scope nat_scope.
Implicit Types m n x y : nat.

(* Specifications: *)
Theorem O_or_S n : {m : nat | S m = n} + {0 = n}.