proposition: Lemma IR_opp_as_CR : forall x, (IRasCR ([--]x)== - IRasCR x)%CR.
proof: Proof. apply (map_pres_minus _ _ (iso_map_rht _ _ CRIR_iso)). Qed.
imports: CoRN.algebra.RSetoid CoRN.metric2.Metric CoRN.metric2.UniformContinuity CoRN.reals.CauchySeq CoRN.reals.iso_CReals CoRN.reals.R_morphism CoRN.reals.fast.CRArith CoRN.model.reals.CRreal CoRN.tactics.CornTac