One of the mysteries of the English language finally explained.
1Mathematics and Science. The branch of algebra concerned with the properties and applications of groups.
2Sociology. Any of various theories concerned with the dynamics within or between social groups, or with the influence of social groups on people's thinking or behaviour.
Late 19th century. From group + theory, in sense 1 after German Gruppentheorie.
group theory/ˈɡruːp ˌθɪəri/
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