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[求助] 请教三个代数问题 the socle and injective envelope of indecomposable modules

请教三个代数问题 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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