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December 8th, 2008, 06:44 PM  #1 
Newbie Joined: Nov 2008 Posts: 6 Thanks: 0  commutative diagram, module homomorphisms
Suppose is a commutative diagram of modules and module homomorphisms. (a) Suppose that is injective. Prove that the map is injective. (b) Suppose that is surjective. Prove that the map is surjective. 

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