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This is a glossary of representation theory in mathematics.

The term "module" is often used synonymously for a representation; for the module-theoretic terminology, see also glossary of module theory.

See also Glossary of Lie groups and Lie algebras, list of representation theory topics and Category:Representation theory.

Notations: We write G m = G L 1 {\displaystyle \mathbb {G} _{m}=GL_{1}}. Thus, for example, a one-representation of a group G is of the form χ : G → G m {\displaystyle \chi :G\to \mathbb {G} _{m}}.

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