Lemmas in algebra | Module theory

Fitting lemma

The Fitting lemma, named after the mathematician Hans Fitting, is a basic statement in abstract algebra. Suppose M is a module over some ring. If M is indecomposable and has finite length, then every endomorphism of M is either an automorphism or nilpotent. As an immediate consequence, we see that the endomorphism ring of every finite-length indecomposable module is local. A version of Fitting's lemma is often used in the representation theory of groups. This is in fact a special case of the version above, since every K-linear representation of a group G can be viewed as a module over the group algebra KG. (Wikipedia).

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Related pages

Group ring | Group representation | Length of a module | Abstract algebra | Local ring | Direct sum of modules | Indecomposable module | Automorphism | Endomorphism | Ring (mathematics) | Module (mathematics) | Endomorphism ring