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[ÇóÖú] Çë½ÌÈý¸ö´úÊýÎÊÌâ the socle and injective envelope of indecomposable modules

Çë½ÌÈý¸ö´úÊýÎÊÌâ the socle and injective envelope of indecomposable modules

1 Assume that $A$ is a finite dimensional $K$-algebra£¬and $M$ a finitely generated indecomposable module, then the socle $socM $ of $M$ is simple£¬why?

2 Assume that $A$ is a finite dimensional $K$-algebra£¬and $M$ a finitely generated  module, is the injective envelope of $M$ finitely generated? why?


3 Assume that $A$ is a finite dimensional $K$-algebra£¬and $M$ a finitely generated indecomposable  module, is the injective envelope of $M$ indecomposable? why?
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