proposition: Lemma Rplus_assoc : forall r1 r2 r3:R, r1 + r2 + r3 = r1 + (r2 + r3).
proof: Proof. intros. apply Rquot1. repeat rewrite Rrepr_plus. apply CReal_plus_assoc. Qed.
imports: ZArith_base ClassicalDedekindReals ConstructiveCauchyReals ConstructiveCauchyRealsMult ConstructiveRcomplete ConstructiveLUB Rdefinitions