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