proposition: Lemma cut_minus_nonpos_0_r x : x ≤ 0 → x ∸ 0 = 0.
proof: Proof. auto. Qed.
imports: Coq.setoid_ring.Ring MathClasses.interfaces.abstract_algebra MathClasses.interfaces.additional_operations MathClasses.interfaces.orders MathClasses.orders.minmax