proposition: Lemma Qnot_le_iff_lt: forall x y : Q, ~ (x <= y)%Q <-> (y < x)%Q.
proof: Proof. intros x y; split. - apply Qnot_le_lt. - apply Qlt_not_le. Qed.
imports: QArith_base Qabs ConstructiveReals ConstructiveCauchyRealsMult Logic.ConstructiveEpsilon ConstructiveCauchyAbs Lia Lqa Qpower QExtra PosExtra ConstructiveExtra Qminmax