Equality
$$A \neq B$$
A is not equal to B
Subset
$$A \not\subseteq B$$
A is not a subset of or equal to B
Superset
$$A \not\supseteq B$$
A is not a superset of or equal to B
Intersection
$$A \cap B =$$
{ }
Union
$$A \cup B =$$
{ acceptance, anger, bargaining, denial, depression, galactic, planetary, stellar }
Symmetric Difference
$$A \ominus B =$$
{ acceptance, anger, bargaining, denial, depression, galactic, planetary, stellar }
Difference
$$A - B =$$
{ acceptance, anger, bargaining, denial, depression }
Difference
$$B - A =$$
{ galactic, planetary, stellar }
Cartesian Product
$$A \times B =$$
{ (acceptance, galactic),
(acceptance, planetary),
(acceptance, stellar),
(anger, galactic),
(anger, planetary),
(anger, stellar),
(bargaining, galactic),
(bargaining, planetary),
(bargaining, stellar),
(denial, galactic),
(denial, planetary),
(denial, stellar),
(depression, galactic),
(depression, planetary),
(depression, stellar) }
Kardashev scale