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
$$A \cup B =$$
{ concrete operational, define, deliver, develop, discover, formal operational, pre-operational, sensorimotor }
Symmetric Difference
$$A \ominus B =$$
{ concrete operational, define, deliver, develop, discover, formal operational, pre-operational, sensorimotor }
Difference
$$A - B =$$
{ concrete operational, formal operational, pre-operational, sensorimotor }
Difference
$$B - A =$$
{ define, deliver, develop, discover }
Cartesian Product
$$A \times B =$$
{ (concrete operational, define),
(concrete operational, deliver),
(concrete operational, develop),
(concrete operational, discover),
(formal operational, define),
(formal operational, deliver),
(formal operational, develop),
(formal operational, discover),
(pre-operational, define),
(pre-operational, deliver),
(pre-operational, develop),
(pre-operational, discover),
(sensorimotor, define),
(sensorimotor, deliver),
(sensorimotor, develop),
(sensorimotor, discover) }
Cognition