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https://math.stackexchange.com/questions/239364/surjective-endomorphisms-of-finitely-generated-modules-are-isomorphisms
您即将离开知乎,请注意您的帐号和财产安全。
https://math.stackexchange.com/questions/239364/surjective-endomorphisms-of-finitely-generated-modules-are-isomorphisms