Removed parts from Zhu citations.

src/op/c-star/gelfand.tex

@@ -10,7 +10,7 @@
 
     is a unital $C^*$-isomorphism. 
 \end{theorem}
-\begin{proof}[Proof, {{\cite[Theorem II.9.4]{Zhu}}}. ]
+\begin{proof}[Proof, {{\cite[Theorem 9.4]{Zhu}}}. ]
     By construction $\Gamma_A$ is a unital algebra homomorphism. 
 
     To see that $\Gamma_A$ preserves involutions, let $y \in A$ be self-adjoint. By \autoref{proposition:gelfand-transform-gymnastics} and \autoref{proposition:self-adjoint-spectrum}, $\Gamma_A(y)(\Omega(A)) = \sigma_A(y) \subset \real$, so $\Gamma_A(y) \in C(\Omega(A); \real)$. For any $x \in A$, write $x = \text{Re}(x) + i\text{Im}(x)$, where $\text{Re}(x)$ and $\text{Im}(x)$ are both self-adjoint, then