An evaluation morphism
Let
- Show that
is a prime ideal. - Compute
and then state the conclusion of the First Isomorphism Theorem applied to the homomorphism .
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Let $z\in {\bf C}$ be a complex number and let $\epsilon_z:{\bf R}[x]\to {\bf C}$ be the evaluation homomorphism given by $\epsilon_z(p)=p(z)$ for each $p\in {\bf R}[x]$.
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\begin{enumerate}[label=(\alph*)]
\item Show that $\ker(\epsilon_z)$ is a prime ideal.
\item Compute $\ker(\epsilon_{1+i}), \operatorname{im}(\epsilon_{1+i})$ and then state the conclusion of the First Isomorphism Theorem applied to the homomorphism $\epsilon_{1+i}$.
\end{enumerate}