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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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Local Open Scope R_scope.
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(** Rsqr : some results                             *)
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Ltac ring_Rsqr := unfold Rsqr; ring.

Lemma canonical_Rsqr :
forall (a:nonzeroreal) (b c x:R),
a * Rsqr x + b * x + c =
a * Rsqr (x + b / (2 * a)) + (4 * a * c - Rsqr b) / (4 * a).