Use proper markup.

git-svn-id: https://svn.dealii.org/trunk@25622 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-15/doc/intro.dox b/deal.II/examples/step-15/doc/intro.dox
index 7c3e096e115a038ec0778d9d067ef5994b7f9b9a..33494379ebcca539b095191b5ef115850227be48 100644 (file)
--- a/deal.II/examples/step-15/doc/intro.dox
+++ b/deal.II/examples/step-15/doc/intro.dox
@@ -288,5 +288,5 @@ follows:
 
 The testcase we solve is chosen as follows: We seek to find the solution of
 minimal surface over the unit disk $\Omega=\{\mathbf x: \|\mathbf
-x\|<1\}\subset \R^2$ where the surface attains the values
+x\|<1\}\subset {\mathbb R}^2$ where the surface attains the values
 $u(x,y)|{\partial\Omega} = g(x,y):=\sin(2 \pi (x+y))$ along the boundary.