The standard method of solving the problem is to use fundamental relations.

There is nothing new about using public relations with a commercial twist in foreign policy.

Students investigate and study the social groups in human society using history, economics, geography, law, psychology and international relations.

American colleges have used public relations in the promotion of higher education.

American Express publicized the initiative using social media, advertising, and public relations.

War on Terror has been used in the following disciplines: geography, geopolitics, international relations and politics.

They have also used grassroots tactics, public relations, and demonstrations.

Systems are therefore modelled using sets and relations between sets.

You propose that we move in the direction of using contractual relations.

Then a rather difficult argument using generators and relations in the group G shows that the set is closed under taking inverses.