begin{equation*}
  begin{aligned}
     D_1(0, 0) &= 0, && phantom{for} \
     D_1(i, 0) &= D_1(i-1, 0) - delta, &&  text{for} 1 leq j leq n, \
     D_1(0, j) &= 0, &&  text{for} 1 leq j leq m, \
  end{aligned}
  end{equation*}