Union
$$A \cup B =$$
{ courage, friend, handmaid, justice, master, praiseworthy, prudence, sister, temperance, undesirable, wasteful }
Symmetric Difference
$$A \ominus B =$$
{ courage, friend, handmaid, justice, master, praiseworthy, prudence, sister, temperance, undesirable, wasteful }
Difference
$$A - B =$$
{ friend, handmaid, master, praiseworthy, sister, undesirable, wasteful }
Cartesian Product
$$A \times B =$$
{ (friend, courage),
(friend, justice),
(friend, prudence),
(friend, temperance),
(handmaid, courage),
(handmaid, justice),
(handmaid, prudence),
(handmaid, temperance),
(master, courage),
(master, justice),
(master, prudence),
(master, temperance),
(praiseworthy, courage),
(praiseworthy, justice),
(praiseworthy, prudence),
(praiseworthy, temperance),
(sister, courage),
(sister, justice),
(sister, prudence),
(sister, temperance),
(undesirable, courage),
(undesirable, justice),
(undesirable, prudence),
(undesirable, temperance),
(wasteful, courage),
(wasteful, justice),
(wasteful, prudence),
(wasteful, temperance) }
Cardinal virtues