%%% align-mkiv.tex
% defining an alignment structure
\definemathmatrix[alignedcases]
                [align={right,left,left},
                distance=3pt,
                left={\left\{\;},
                right={\right.},
                style=\displaystyle]

\starttext

\startformula
\startalignedcases
\NC -\partial_t \Delta \psi + \Delta^2 \psi - \Delta \psi   \NC = 0 \NC \quad \mbox{in }\, (0,\infty)\times \Omega  \NR
\NC \psi (0,x) \NC= \psi_0(x) \NC \quad \mbox{in }\, \Omega \NR
\NC \psi (t,\sigma ) \NC= 0 \NC \quad \mbox{on }\, (0,\infty)\times \partial\Omega \NR
\NC {\partial \psi  \over  \partial {\bf n}}(t,\sigma ) \NC = 0 \NC \quad \mbox{on }\, (0,\infty)\times \partial\Omega. 
\stopalignedcases
\stopformula

\CONTEXT\ \contextmark\ \contextversion
\stoptext