Try to fix latex formula.

diff --git a/examples/step-59/doc/intro.dox b/examples/step-59/doc/intro.dox
index d723fcc96b52d3fff709ed55a6b10af231b569cb..67b77a147c5f122cb0da7975a8b9d95a68c9636c 100644 (file)
--- a/examples/step-59/doc/intro.dox
+++ b/examples/step-59/doc/intro.dox
@@ -49,10 +49,10 @@ For this tutorial program, we exemplify the matrix-free DG framework for the
 interior penalty discretization of the Laplacian, i.e., the same scheme as the
 one used for the step-39 tutorial program. The discretization of the Laplacian
 is given by the following weak form
-@f{eqnarray*}
-&&\sum_{K\in\text{cells}} \left(\nabla v_h, \nabla u_h\right)_{K}+\\
-&&\sum_{F\in\text{faces}}\Big(-\left<[\![v_h]\!], \{\!\{\nabla u_h\}\!\}\right>_{F} - \left<\{\!\{\nabla v_h\}\!\}, \left<[\![u_h]\!]\right>_{F}\right) + \left<\left<[\![v_h]\!], \sigma \left<[\![u_h]\!]\right>_{F}\Big) \\
-&&= \sum_{K\in\text{cells}}\left(v_h, f\right)_{K},
+@f{align*}
+&\sum_{K\in\text{cells}} \left(\nabla v_h, \nabla u_h\right)_{K}+\\
+&\sum_{F\in\text{faces}}\Big(-\left<[\![v_h]\!], \{\!\{\nabla u_h\}\!\}\right>_{F} - \left<\{\!\{\nabla v_h\}\!\}, \left<[\![u_h]\!]\right>_{F}\right) + \left<\left<[\![v_h]\!], \sigma \left<[\![u_h]\!]\right>_{F}\Big) \\
+&= \sum_{K\in\text{cells}}\left(v_h, f\right)_{K},
 @f}
 where $[\![v]\!] = v^- \mathbf{n}^- + v^+ \mathbf{n}^+ = \mathbf n^{-}
 \left(v^- - v^+\right)$ denotes the directed jump of the quantity $v$ from the