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
$$A \cup B =$$
{ Liskov substitution, dependency inversion, effort, external stimulus, idle, interface segregation, open-closed, single responsibility }
Symmetric Difference
$$A \ominus B =$$
{ Liskov substitution, dependency inversion, effort, external stimulus, idle, interface segregation, open-closed, single responsibility }
Difference
$$A - B =$$
{ Liskov substitution, dependency inversion, interface segregation, open-closed, single responsibility }
Difference
$$B - A =$$
{ effort, external stimulus, idle }
Cartesian Product
$$A \times B =$$
{ (Liskov substitution, effort),
(Liskov substitution, external stimulus),
(Liskov substitution, idle),
(dependency inversion, effort),
(dependency inversion, external stimulus),
(dependency inversion, idle),
(interface segregation, effort),
(interface segregation, external stimulus),
(interface segregation, idle),
(open-closed, effort),
(open-closed, external stimulus),
(open-closed, idle),
(single responsibility, effort),
(single responsibility, external stimulus),
(single responsibility, idle) }
SOLID