I understand I must find some element that map to identity but what condition $\phi(1)=4$ is related ? and how to compute $(\phi )(25)$? I must find mapping from 25 to $Z_{7}$ isn't it ? is that 4 ?
2026-03-25 23:38:24.1774481904
How to compute $\operatorname{Ker}(\phi )$ and $(\phi )(25)$ for $(\phi ):Z\rightarrow Z_{7}$ such that $\phi(1)=4$?
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