From: bonito <bonito@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Thu, 6 Jan 2011 15:21:36 +0000 (+0000)
Subject: git-svn-id: https://svn.dealii.org/trunk@23135 0785d39b-7218-0410-832d-ea1e28bc413d
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f2313f906a14e605701e16c2a269a4393cd72909;p=dealii-svn.git

git-svn-id: https://svn.dealii.org/trunk@23135 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/examples/step-38/doc/intro.dox b/deal.II/examples/step-38/doc/intro.dox
index 4fb138d76b..bcdf18fee1 100644
--- a/deal.II/examples/step-38/doc/intro.dox
+++ b/deal.II/examples/step-38/doc/intro.dox
@@ -192,10 +192,8 @@ solution. Since the solution function and its numerical approximation are only
 defined on the manifold, the obvious definition of this error functional is
 $| e |_{H^1(\Gamma)} 
   = | \nabla_\Gamma e |_{L_2(\Gamma)} 
-  = \left( \int_\Gamma | \left[\mathbf 1 - \mathbf n \otimes \mathbf
-n\right]\nabla (u-u_h) |^2 \right)^{1/2}$. This requires us to provide the
-<i>tangential</i> gradient $\left[\mathbf 1 - \mathbf n \otimes \mathbf
-n\right]\nabla u$ to the function VectorTools::integrate_difference
+  = \left( \int_\Gamma | \nabla_\Gamma (u-u_h) |^2 \right)^{1/2}$. This requires us to provide the
+<i>tangential</i> gradient to the function VectorTools::integrate_difference
 (first introduced in step-7), which we
 will do by implementing the function <code>Solution::gradient</code> in the
 program below.