fact: Definition CReal_inv_pos_cm (x : CReal) (xPos : 0 < x) (n : Z):= (Z.min (CRealLowerBound x xPos) (n + 2 * (CRealLowerBound x xPos)))%Z.
imports: QArith Qabs Qround Qpower Logic.ConstructiveEpsilon ConstructiveCauchyReals Lia Lqa QExtra