GradientEstimator.

git-svn-id: https://svn.dealii.org/trunk@2723 0785d39b-7218-0410-832d-ea1e28bc413d

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@@ -59,6 +59,9 @@
   vectors of a solver as finite element functions using
   <code class="class">DataOut</code>.
 
+  <li> New: <code class="class">class GradientEstimator</code>
+  estimates the norm of the gradient on each cell from finite
+  difference approximations. 
 </ol>
 
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