[c mediumvioletred] (as used in expressions)
acid base theory
auteur theory
automata theory
band theory
BCS theory
bundle theory
catastrophe theory
chaos theory
communication theory
information theory
control theory
critical theory
decision theory
domino theory
double aspect theory
dual aspect theory
electroweak theory
field theory
film theory
game theory
germ theory
germ plasm theory
grand unified theory
grand unification theory
graph theory
group theory
identity theory
just war theory
kinetic theory of gases
marginal productivity theory
measure theory
money quantity theory of
number theory
probability theory
quantum field theory
queuing theory
set theory
speech act theory
steady state theory
superstring theory
switching theory
types theory of
{{link=unified field theory">unified field theory