Section ComRingTheory.
Variable R : comRingType.
Implicit Types x y : R.
Canonical mul_comoid := Monoid.ComLaw mulrC.

Lemma mulrCA : @left_commutative R R *%R. Proof. exact: mulmCA. Qed.
Lemma mulrAC : @right_commutative R R *%R. Proof. exact: mulmAC. Qed.
Lemma mulrACA : @interchange R *%R *%R. Proof. exact: mulmACA. Qed.