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
$$A \cup B =$$
{ interpret, logopoeia, melopoeia, organize, phanopoeia, select, stimulus }
Symmetric Difference
$$A \ominus B =$$
{ interpret, logopoeia, melopoeia, organize, phanopoeia, select, stimulus }
Difference
$$A - B =$$
{ logopoeia, melopoeia, phanopoeia }
Difference
$$B - A =$$
{ interpret, organize, select, stimulus }
Cartesian Product
$$A \times B =$$
{ (logopoeia, interpret),
(logopoeia, organize),
(logopoeia, select),
(logopoeia, stimulus),
(melopoeia, interpret),
(melopoeia, organize),
(melopoeia, select),
(melopoeia, stimulus),
(phanopoeia, interpret),
(phanopoeia, organize),
(phanopoeia, select),
(phanopoeia, stimulus) }
Optical illusion