Changes

<math>\prod_{i=1}^n e_i ~=~ e_1 \cdot \ldots \cdot e_n

<math>\prod_{i=1}^n e_i ~=~ e_1 \cdot \ldots \cdot e_n

~\text{where}~

~\text{where}~

\left\{\begin{matrix} e_i = a_i \\ \text{or} \\ e_i = \texttt{(} a_1 \texttt{)} \end{matrix}\right\}

\left\{\begin{matrix} e_i = a_i \\ \text{or} \\ e_i = \texttt{(} a_i \texttt{)} \end{matrix}\right\}

~\text{for}~ i = 1 ~\text{to}~ n.\!</math>

~\text{for}~ i = 1 ~\text{to}~ n.\!</math>

</blockquote>

</blockquote>