Equation 23.2.26C2B05F8B6DCA

\begin{equation} \begin{cases} A^ n=\mathrm{e}^{-na}\omega _1^ n,\\ \mathrm{dd}^{\mathrm{c}}\bigl (\mathrm{e}^{(n-1)a}A^{n-1}\bigr )=0. \end{cases} \end{equation}