(************************************************************************)
(*         *      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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(** * DecimalQ  Proofs that conversions between decimal numbers and [Q] are bijections. *)

Lemma dnorm_spec_e d :
match d, dnorm d with
| Decimal _ _, Decimal _ _ => True
| DecimalExp _ _ e, Decimal _ _ => norm e = Pos zero
| DecimalExp _ _ e, DecimalExp _ _ e' => e' = norm e /\ e' <> Pos zero
| Decimal _ _, DecimalExp _ _ _ => False
end.