proposition: Lemma le_1_2 : 1 ≤ 2.
proof: Proof. now apply nonneg_plus_le_compat_r, le_0_1. Qed.
imports: Coq.setoid_ring.Ring MathClasses.interfaces.abstract_algebra MathClasses.interfaces.orders MathClasses.theory.rings MathClasses.orders.orders MathClasses.orders.maps