Union
$$A \cup B =$$
{ Anthropology, Economics, Geography, Political science, Psychology, Sociology, gas, liquid, plasma, solid }
Symmetric Difference
$$A \ominus B =$$
{ Anthropology, Economics, Geography, Political science, Psychology, Sociology, gas, liquid, plasma, solid }
Difference
$$A - B =$$
{ Anthropology, Economics, Geography, Political science, Psychology, Sociology }
Cartesian Product
$$A \times B =$$
{ (Anthropology, gas),
(Anthropology, liquid),
(Anthropology, plasma),
(Anthropology, solid),
(Economics, gas),
(Economics, liquid),
(Economics, plasma),
(Economics, solid),
(Geography, gas),
(Geography, liquid),
(Geography, plasma),
(Geography, solid),
(Political science, gas),
(Political science, liquid),
(Political science, plasma),
(Political science, solid),
(Psychology, gas),
(Psychology, liquid),
(Psychology, plasma),
(Psychology, solid),
(Sociology, gas),
(Sociology, liquid),
(Sociology, plasma),
(Sociology, solid) }
Matter