Replace by less offensive latex

git-svn-id: https://svn.dealii.org/trunk@25877 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-23/doc/intro.dox b/deal.II/examples/step-23/doc/intro.dox
index c8feb1dba81ad76af066829c793a44694f518aef..c7b70487afc512ae3ba84566e334fd4d653785af 100644 (file)
--- a/deal.II/examples/step-23/doc/intro.dox
+++ b/deal.II/examples/step-23/doc/intro.dox
@@ -403,9 +403,12 @@ a square $[-1,1]^2$ and
        \\
        u_1 &=& 0,
        \\
-       g &=& \left\{\begin{matrix}\sin (4\pi t) \\ 0\end{matrix}
-       \qquad {\textrm{for}\ t\le \frac 12, x=-1, -\frac 13<y<\frac 13
-       \atop \textrm{otherwise}}
+       g &=& \left\{\begin{matrix}\sin (4\pi t)
+       &\qquad& \text{for }\ t\le \frac 12, x=-1, -\frac 13<y<\frac 13
+       \\
+        0
+       &&\text{otherwise}
+       \end{matrix}
        \right.
 @f}
 This corresponds to a membrane initially at rest and clamped all around, where