(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Show that multiplicative group Z5 is not isomorphic to multiplicative group Z8 by showing that the first group has an element of order 4 but the second group does not.

3. The attempt at a solution

Once again, I'm not even sure how to begin this one.

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# Not isomorphic, different order

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