Show the range of f is isomorphic to a quotient of z

  • #1
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Homework Statement


Let G be any group and a in G, define f: Z → G by f(n) = a^n

Apply any isomorphism theorem to show that range of f is isomorphic to a quotient group of Z

Homework Equations




The Attempt at a Solution


The range of f is a^n , then quotient group of Z is Z/nZ
Apply the first isomorphism theorem , we have a^n isomorphic with Z/nZ
 

Answers and Replies

  • #2
746
13
if you can show that f is a homomorphism & find its kernel then you'll have your isomorphism by the first isomorphism theorem. the range of f is actually {an ∈ G | n ∈ Z}, not just an. the kernel of f is {m ∈ Z | am = e}, not nZ (but you're not far off). you might need to show that (Z, +) is a group in order to make sure that f is actually a group homomorphism, unless you've already established that in your class.
 
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