From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 18 Apr 2023 03:49:37 +0000 (-0600)
Subject: Replace \atan by \text{atan} because the former is apparently not part of MathJAX.
X-Git-Tag: v9.5.0-rc1~318^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F14988%2Fhead;p=dealii.git

Replace \atan by \text{atan} because the former is apparently not part of MathJAX.
---

diff --git a/examples/step-7/doc/intro.dox b/examples/step-7/doc/intro.dox
index 726d570fff..f70cf04e0e 100644
--- a/examples/step-7/doc/intro.dox
+++ b/examples/step-7/doc/intro.dox
@@ -191,7 +191,7 @@ denote $\bar u|_{\Gamma_1}=g_1$ and ${\mathbf n}\cdot \nabla\bar u|_{\Gamma_2}=g
   $f = -\Delta \bar u + \bar u$ is. Since the derivative of an exponential
   is relatively straightforward to compute, the choice above satisfies this
   requirement, whereas a function of the kind
-  $\bar u(\mathbf x) = \atan\left(\|\mathbf x\|^{\|\mathbf x\|}\right)$
+  $\bar u(\mathbf x) = \text{atan}\left(\|\mathbf x\|^{\|\mathbf x\|}\right)$
   would have presented greater difficulties.
   (ii) You *don't* want $\bar u$ be a polynomial of low degree. That is
   because if you choose the polynomial degree of your finite element