We introduce roots of indecomposable modules over group algebras of finite groups, and we investigate some of their properties. This allows us to correct an error in Landrock's book which has to do with roots of simple modules.

MSC Classifications:

20C20, 20C05 show english descriptions Modular representations and characters
Group rings of finite groups and their modules [See also 16S34] 20C20 - Modular representations and characters
20C05 - Group rings of finite groups and their modules [See also 16S34]

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