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+\begin{proposition}\label{calculation_link_order}
+    Let $A,B,C$ be sets.
+    $A=C$.
+\end{proposition}
+\begin{proof}
+    \begin{align*}
+        A
+            &= B
+                \\
+            &= C
+    \end{align*}
+    Follows by assumption.
+\end{proof}