This is the question with its answer:
It is not clear for me why we should show the first statement in the following picture:
Could anyone explain this for me please?
Since $i$ generates the group then $z=i^m$ for some $m$. Now, if $i$ maps to $i^k$ then $z$ maps to $i^{mk}=z^k$ following the homomorphism properties.
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Since $i$ generates the group then $z=i^m$ for some $m$. Now, if $i$ maps to $i^k$ then $z$ maps to $i^{mk}=z^k$ following the homomorphism properties.