Quantum theory 551 Economic systems and theories 357 English Literary Theory; English Literature 300 Mathematics 288 Feminist theory 254 Number theory-- Algebra-- Mathematics 229 Knowledge, Theory of 212 Economics 189 Philosophy 188 Number theory 181 Graph theory 169 Group theory 167 Graph theory-- Mathematics 158 Physics 151 History 126 Literature 123 Social Sciences 122 History and criticism 121 Political theories and ideologies 117 Theory 116 Theory, etc 116 Probability Theory 112 Coding theory 109 Game theory 108 Literary criticism-- Philosophy & theory of literature 104 Economic theory 103 Malayalam; Literary Theories 100 Quantum field theory 94 Set theory 91 Sociological theories and philosophy-- Sociology 88