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
$$A \cup B =$$
{ archaeology, biological anthropology, cultural anthropology, interval, linguistic anthropology, nominal, ordinal, ratio }
Symmetric Difference
$$A \ominus B =$$
{ archaeology, biological anthropology, cultural anthropology, interval, linguistic anthropology, nominal, ordinal, ratio }
Difference
$$A - B =$$
{ interval, nominal, ordinal, ratio }
Difference
$$B - A =$$
{ archaeology, biological anthropology, cultural anthropology, linguistic anthropology }
Cartesian Product
$$A \times B =$$
{ (interval, archaeology),
(interval, biological anthropology),
(interval, cultural anthropology),
(interval, linguistic anthropology),
(nominal, archaeology),
(nominal, biological anthropology),
(nominal, cultural anthropology),
(nominal, linguistic anthropology),
(ordinal, archaeology),
(ordinal, biological anthropology),
(ordinal, cultural anthropology),
(ordinal, linguistic anthropology),
(ratio, archaeology),
(ratio, biological anthropology),
(ratio, cultural anthropology),
(ratio, linguistic anthropology) }
Level of measurement