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
$$A \cup B =$$
{ being, essence, notion, preview, question, read, summarize, test }
Symmetric Difference
$$A \ominus B =$$
{ being, essence, notion, preview, question, read, summarize, test }
Difference
$$A - B =$$
{ preview, question, read, summarize, test }
Difference
$$B - A =$$
{ being, essence, notion }
Cartesian Product
$$A \times B =$$
{ (preview, being),
(preview, essence),
(preview, notion),
(question, being),
(question, essence),
(question, notion),
(read, being),
(read, essence),
(read, notion),
(summarize, being),
(summarize, essence),
(summarize, notion),
(test, being),
(test, essence),
(test, notion) }
Georg Wilhelm Friedrich Hegel