Union
$$A \cup B =$$
{ agreeableness, annotate, conscientiousness, encode, extraversion, neuroticism, openness, ponder, read }
Symmetric Difference
$$A \ominus B =$$
{ agreeableness, annotate, conscientiousness, encode, extraversion, neuroticism, openness, ponder, read }
Difference
$$A - B =$$
{ annotate, encode, ponder, read }
Difference
$$B - A =$$
{ agreeableness, conscientiousness, extraversion, neuroticism, openness }
Cartesian Product
$$A \times B =$$
{ (annotate, agreeableness),
(annotate, conscientiousness),
(annotate, extraversion),
(annotate, neuroticism),
(annotate, openness),
(encode, agreeableness),
(encode, conscientiousness),
(encode, extraversion),
(encode, neuroticism),
(encode, openness),
(ponder, agreeableness),
(ponder, conscientiousness),
(ponder, extraversion),
(ponder, neuroticism),
(ponder, openness),
(read, agreeableness),
(read, conscientiousness),
(read, extraversion),
(read, neuroticism),
(read, openness) }
Big Five personality traits