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May 14th, 2009, 09:40 PM  #1 
Newbie Joined: Nov 2008 Posts: 25 Thanks: 0  Commutative Diagram of Modules
Let be a ring. The following is a commutative diagram of module homomorphisms, and the rows are exact. Suppose that is surjective and that is an isomorphism. Prove that is an isomorphism. Attempt Onto and both and are both onto so is onto. 11 This one doesn't seem as trivial. I am a bit confused on showing this. Thanks in advance for any hints. 

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commutative, diagram, modules 
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