Union
$$A \cup B =$$
{ Electromagnetic Force., Gravity., Liskov substitution, Strong Force., Weak Force., dependency inversion, interface segregation, open-closed, single responsibility }
Symmetric Difference
$$A \ominus B =$$
{ Electromagnetic Force., Gravity., Liskov substitution, Strong Force., Weak Force., dependency inversion, interface segregation, open-closed, single responsibility }
Difference
$$A - B =$$
{ Electromagnetic Force., Gravity., Strong Force., Weak Force. }
Difference
$$B - A =$$
{ Liskov substitution, dependency inversion, interface segregation, open-closed, single responsibility }
Cartesian Product
$$A \times B =$$
{ (Electromagnetic Force., Liskov substitution),
(Electromagnetic Force., dependency inversion),
(Electromagnetic Force., interface segregation),
(Electromagnetic Force., open-closed),
(Electromagnetic Force., single responsibility),
(Gravity., Liskov substitution),
(Gravity., dependency inversion),
(Gravity., interface segregation),
(Gravity., open-closed),
(Gravity., single responsibility),
(Strong Force., Liskov substitution),
(Strong Force., dependency inversion),
(Strong Force., interface segregation),
(Strong Force., open-closed),
(Strong Force., single responsibility),
(Weak Force., Liskov substitution),
(Weak Force., dependency inversion),
(Weak Force., interface segregation),
(Weak Force., open-closed),
(Weak Force., single responsibility) }
SOLID