</span>        
  <span class="keyword">typedef</span> <span class="identifier">stepper_base_type</span><span class="special">::</span><span class="identifier">algebra_type</span>                          <a name="boost.numeric.odeint.runge_kutta4_classic.algebra_type"></a><span class="identifier">algebra_type</span><span class="special">;</span>     
  <span class="keyword">typedef</span> <span class="identifier">stepper_base_type</span><span class="special">::</span><span class="identifier">operations_typ