Fix typo

exercises/Ex14.tex

@@ -157,7 +157,7 @@
     \end{split}
     \end{equation}
     which is an odd function under $\vp \mapsto - \vp$ and thus gives zero under integration. \par 
-    We are then left with the first two terms of Eq.~\ref{eq_semifinalsk}. Since they are both multiplied by $\epsilon^{kji}$, it is convenient to antisymmetrize them,
+    We are then left with the first two terms of Eq.~\eqref{eq_semifinalsk}. Since they are both multiplied by $\epsilon^{kji}$, it is convenient to antisymmetrize them,
     \begin{equation}
     \label{almost_final}
     \begin{split}