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(*         *   The Coq Proof Assistant / The Coq Development Team       *)
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(*         *     GNU Lesser General Public License Version 2.1          *)
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(*                                                                      *)
(* Micromega: A reflexive tactic using the Positivstellensatz           *)
(*                                                                      *)
(*  Frédéric Besson (Irisa/Inria) 2006-2008                             *)
(*                                                                      *)
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Require Setoid.
(*Declare ML Module "micromega_plugin".*)
Definition Rsrt : ring_theory R0 R1 Rplus Rmult Rminus Ropp (@eq R).
Open Scope R_scope.

Lemma Q2R_inv_ext : forall x,
Q2R (/ x) = (if Qeq_bool x 0 then 0 else / Q2R x).