\begin{equation*} \ifnumSw
\kLevBF_{t+1,i}  =
\begin{cases}
    \aLevBF_{t,i} /\PLives & \text{if } \pDies_{t+1,i} = 0 \\
     0                       & \text{if } \pDies_{t+1,i} = 1,
\end{cases} \label{eq:tontine}
\end{equation*}
