Fix latex formula

git-svn-id: https://svn.dealii.org/trunk@31907 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-42/doc/intro.dox b/deal.II/examples/step-42/doc/intro.dox
index 27ce612c59b4804330c6720348918404a7d7ae8f..62168896d138fa82dc181969fdd66b19addaaf12 100644 (file)
--- a/deal.II/examples/step-42/doc/intro.dox
+++ b/deal.II/examples/step-42/doc/intro.dox
@@ -55,7 +55,7 @@ step-32.
 The classical formulation of the problem possesses the following form:
 @f{align*}
  \varepsilon(\mathbf u) &= A\sigma + \varepsilon^p & &\quad\text{in } \Omega,\\
-  -\textrm{\textrm{div}}\ \sigma &= \mathbf f & &\quad\text{in } \Omega,\\
+  -\textrm{div}\ \sigma &= \mathbf f & &\quad\text{in } \Omega,\\
   \varepsilon^p:(\tau - \sigma) &\geq 0\quad\forall\tau\text{ with
   }\mathcal{F}(\tau)\leq 0 & &\quad\text{in } \Omega,\\
   \mathbf u &= 0 & &\quad\text{on }\Gamma_D,\\