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
$$A \cup B =$$
{ bitter, critical, salty, savory, sour, speculative grammar, speculative rhetoric, sweet }
Symmetric Difference
$$A \ominus B =$$
{ bitter, critical, salty, savory, sour, speculative grammar, speculative rhetoric, sweet }
Difference
$$A - B =$$
{ critical, speculative grammar, speculative rhetoric }
Difference
$$B - A =$$
{ bitter, salty, savory, sour, sweet }
Cartesian Product
$$A \times B =$$
{ (critical, bitter),
(critical, salty),
(critical, savory),
(critical, sour),
(critical, sweet),
(speculative grammar, bitter),
(speculative grammar, salty),
(speculative grammar, savory),
(speculative grammar, sour),
(speculative grammar, sweet),
(speculative rhetoric, bitter),
(speculative rhetoric, salty),
(speculative rhetoric, savory),
(speculative rhetoric, sour),
(speculative rhetoric, sweet) }
Charles Sanders Peirce