167 \begin{tabular}{lcl}

   167 \begin{tabular}{lcl}

   168 $L \; (\ZERO)$ & $\dn$ & $\phi$\\

   168 $L \; (\ZERO)$ & $\dn$ & $\phi$\\

   169 $L \; (\ONE)$ & $\dn$ & $\{[]\}$\\

   169 $L \; (\ONE)$ & $\dn$ & $\{[]\}$\\

   170 $L \; (c)$ & $\dn$ & $\{[c]\}$\\

   170 $L \; (c)$ & $\dn$ & $\{[c]\}$\\

   171 $L \; (r_1 + r_2)$ & $\dn$ & $ L \; (r_1) \cup L \; ( r_2)$\\

   171 $L \; (r_1 + r_2)$ & $\dn$ & $ L \; (r_1) \cup L \; ( r_2)$\\

   173 $L \; (r^*)$ & $\dn$ & $ (L(r))^*$

   173 $L \; (r^*)$ & $\dn$ & $ (L(r))^*$

   174 \end{tabular}

   174 \end{tabular}

   175 \end{center}

   175 \end{center}

   176 \noindent

   176 \noindent

   177 Which is also called the "language interpretation" of

   177 Which is also called the "language interpretation" of