From 100050b3d49b794b86960ad8d44427ce0ff859b8 Mon Sep 17 00:00:00 2001
From: Nils Schween <nils.schween@mpi-hd.mpg.de>
Date: Thu, 28 Sep 2023 15:45:07 +0200
Subject: [PATCH] exchange richardson.h with gmres.h and adapt documentation

---
 examples/step-12/step-12.cc | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/examples/step-12/step-12.cc b/examples/step-12/step-12.cc
index fede611875..453284723c 100644
--- a/examples/step-12/step-12.cc
+++ b/examples/step-12/step-12.cc
@@ -45,12 +45,12 @@
 // This header is needed for FEInterfaceValues to compute integrals on
 // interfaces:
 #include <deal.II/fe/fe_interface_values.h>
-// We are going to use the simplest possible solver, called Richardson
-// iteration, that represents a simple defect correction. This, in combination
-// with a block SSOR preconditioner (defined in precondition_block.h), that
-// uses the special block matrix structure of system matrices arising from DG
-// discretizations.
-#include <deal.II/lac/solver_richardson.h>
+// We are going to use a standard solver, called Generalized minimal residual
+// method (GMRES). It is a iterative solver which is applicable to arbitrary
+// invertible matrices. This, in combination with a block SSOR preconditioner
+// (defined in precondition_block.h), that uses the special block matrix
+// structure of system matrices arising from DG discretizations.
+#include <deal.II/lac/solver_gmres.h>
 #include <deal.II/lac/precondition_block.h>
 // We are going to use gradients as refinement indicator.
 #include <deal.II/numerics/derivative_approximation.h>
-- 
2.39.5