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SNOOTCHIEBOOCHEE
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Homework Statement
let phi : G --->G' be an isomorphism of groups. let x element of G and let x'=phi(x)
Prove that the orders of x and x' are equal
The Attempt at a Solution
I don't even know what the order of a isomorphism means. As far as i know, an isomorphism is just a bijective map from G to G'. How does this have order?
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