Union
$$A \cup B =$$
{ authority, conformity, grammar, logic, obedience, rhetoric, self-interest, social contract, universal ethics }
Symmetric Difference
$$A \ominus B =$$
{ authority, conformity, grammar, logic, obedience, rhetoric, self-interest, social contract, universal ethics }
Difference
$$B - A =$$
{ authority, conformity, obedience, self-interest, social contract, universal ethics }
Cartesian Product
$$A \times B =$$
{ (grammar, authority),
(grammar, conformity),
(grammar, obedience),
(grammar, self-interest),
(grammar, social contract),
(grammar, universal ethics),
(logic, authority),
(logic, conformity),
(logic, obedience),
(logic, self-interest),
(logic, social contract),
(logic, universal ethics),
(rhetoric, authority),
(rhetoric, conformity),
(rhetoric, obedience),
(rhetoric, self-interest),
(rhetoric, social contract),
(rhetoric, universal ethics) }
Trivium