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
$$A \cup B =$$
{ forming, interpret, norming, organize, performing, select, storming }
Symmetric Difference
$$A \ominus B =$$
{ forming, interpret, norming, organize, performing, select, storming }
Difference
$$A - B =$$
{ forming, norming, performing, storming }
Difference
$$B - A =$$
{ interpret, organize, select }
Cartesian Product
$$A \times B =$$
{ (forming, interpret),
(forming, organize),
(forming, select),
(norming, interpret),
(norming, organize),
(norming, select),
(performing, interpret),
(performing, organize),
(performing, select),
(storming, interpret),
(storming, organize),
(storming, select) }
Tuckman's stages of group development