Structure law := Law {
  operator : T -> T -> T;
  _ : associative operator;
  _ : left_id idm operator;
  _ : right_id idm operator
}.Structure law := Law {
  operator : T -> T -> T;
  _ : associative operator;
  _ : left_id idm operator;
  _ : right_id idm operator
}.Structure law := Law {
  operator : T -> T -> T;
  _ : associative operator;
  _ : left_id idm operator;
  _ : right_id idm operator
}.Structure com_law := ComLaw {
   com_operator : law;
   _ : commutative com_operator
}.Structure com_law := ComLaw {
   com_operator : law;
   _ : commutative com_operator
}.Structure com_law := ComLaw {
   com_operator : law;
   _ : commutative com_operator
}.Structure mul_law := MulLaw {
  mul_operator : T -> T -> T;
  _ : left_zero idm mul_operator;
  _ : right_zero idm mul_operator
}.Structure mul_law := MulLaw {
  mul_operator : T -> T -> T;
  _ : left_zero idm mul_operator;
  _ : right_zero idm mul_operator
}.Structure mul_law := MulLaw {
  mul_operator : T -> T -> T;
  _ : left_zero idm mul_operator;
  _ : right_zero idm mul_operator
}.Structure add_law (mul : T -> T -> T) := AddLaw {
  add_operator : com_law;
  _ : left_distributive mul add_operator;
  _ : right_distributive mul add_operator
}.Structure add_law (mul : T -> T -> T) := AddLaw {
  add_operator : com_law;
  _ : left_distributive mul add_operator;
  _ : right_distributive mul add_operator
}.Structure add_law (mul : T -> T -> T) := AddLaw {
  add_operator : com_law;
  _ : left_distributive mul add_operator;
  _ : right_distributive mul add_operator
}.Notation "[ 'add_law' m 'of' a ]" := (@clone_add_law _ _ m a _ _ id id _ _ id)
  (at level 0, format "[ 'add_law'  m  'of'  a ]") : form_scope.

Lemma mulmACA : interchange mul mul.