proposition: Lemma mul_split_r n x1 x2 y1 y2 : x1 < n → y1 < n → x1 + x2 * n = y1 + y2 * n → x1 = y1 ∧ x2 = y2.
proof: Proof. intros. destruct (mul_split_l n x2 x1 y2 y1); auto with lia. Qed.
imports: Coq(QArith Qcanon) stdpp(well_founded) stdpp(options)