Relationship or property.
Sometimes a synonym for rule.


  • Addition in the set of whole numbers is an internal composition law in \(\mathbb{N}\).
  • Division in the set of integers is not an internal composition law in \(\mathbb{N}\) because the results obtained are not all elements of \(\mathbb{N}\).
  • The multiplication of a vector by a real number (scalar) is an external composition law with results that are vectors.

Try Buzzmath activities for free

and see how the platform can help you.