Remove stray opening bracket in comment

chapters/arrays.tex

@@ -973,7 +973,7 @@ \section{Array Indexing}\label{array-indexing}
 \begin{lstlisting}[language=modelica]
 a[:, j]      // Vector of the j-th column of a.
 a[j]         // Vector of the j-th row of a. Same as: a[j, :]
-a[j : k]     // Same as: {[a[j], a[j+1], $\ldots$, a[k]}
+a[j : k]     // Same as: {a[j], a[j+1], $\ldots$, a[k]}
 a[:, j : k]  // Same as: [a[:, j], a[:, j+1], $\ldots$, a[:, k]]
 \end{lstlisting}
 The range vector operator is just a special case of a vector expression: