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In one of my proof for my assignment I reached a point where I have to prove that $x^9-t^9$ is irreducible in $\mathbb{Z}_7(t^9)[x]$. I am unsure weather this is irreducible. If it is, how do I prove it? Thanks in advance.

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    Agreed, but there is a prime element in $\mathbb{Z}_7[t^9]$, which is a ring, not a field.2012-10-21

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