Union
$$A \cup B =$$
{ agreeableness, conscientiousness, ethos, extraversion, kairos, logos, neuroticism, openness, pathos }
Symmetric Difference
$$A \ominus B =$$
{ agreeableness, conscientiousness, ethos, extraversion, kairos, logos, neuroticism, openness, pathos }
Difference
$$A - B =$$
{ ethos, kairos, logos, pathos }
Difference
$$B - A =$$
{ agreeableness, conscientiousness, extraversion, neuroticism, openness }
Cartesian Product
$$A \times B =$$
{ (ethos, agreeableness),
(ethos, conscientiousness),
(ethos, extraversion),
(ethos, neuroticism),
(ethos, openness),
(kairos, agreeableness),
(kairos, conscientiousness),
(kairos, extraversion),
(kairos, neuroticism),
(kairos, openness),
(logos, agreeableness),
(logos, conscientiousness),
(logos, extraversion),
(logos, neuroticism),
(logos, openness),
(pathos, agreeableness),
(pathos, conscientiousness),
(pathos, extraversion),
(pathos, neuroticism),
(pathos, openness) }