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
$$A \cup B =$$
{ high mass consumption, metaphysics, normative science, phenomenology, pre-conditions, take-off, technological maturity, traditional society }
Symmetric Difference
$$A \ominus B =$$
{ high mass consumption, metaphysics, normative science, phenomenology, pre-conditions, take-off, technological maturity, traditional society }
Difference
$$A - B =$$
{ high mass consumption, pre-conditions, take-off, technological maturity, traditional society }
Difference
$$B - A =$$
{ metaphysics, normative science, phenomenology }
Cartesian Product
$$A \times B =$$
{ (high mass consumption, metaphysics),
(high mass consumption, normative science),
(high mass consumption, phenomenology),
(pre-conditions, metaphysics),
(pre-conditions, normative science),
(pre-conditions, phenomenology),
(take-off, metaphysics),
(take-off, normative science),
(take-off, phenomenology),
(technological maturity, metaphysics),
(technological maturity, normative science),
(technological maturity, phenomenology),
(traditional society, metaphysics),
(traditional society, normative science),
(traditional society, phenomenology) }
Rostow's stages of growth