Let $F$ be a field of characteristic $p>0$. For $a\in F$, I have to compute the fixed field of the $F$-automorphism of the field of rational functions $F(x)$ such that $x\to x+a$.
2026-04-06 07:37:53.1775461073
Fixed field of the $F$-automorphism such that $x\to x+a$
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