3. In the member function: WeightedResidual<dim>::refine_grid(), you firstly defined a Vector error_indicators whose dimension is n_active_cells of the triangulation, then you call the function "estimate_error(error_indicators)" to compute the error_indicators. But in the function "estimate_error(Vector<float>& error_indicators)", I noticed that you reinitialize the error_indicators by calling "error_indicators.reinit(DualSolver<dim>::dof_handler.get_triangulation().n_active_cells());", so why you do this? Since the PrimalSolver and DualSolver are both derived from the base class and they share the same triangulation, then what is the purpose of using DualSolver<dim>::dof_handler.get_triangulation to reinit error_indicator?
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