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<a href="../doxygen/deal.II/changes_after_7_1.html">here.</a></p>
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+ <dt>
+ <strong>2012/04/02: step-41 solves the obstacle problem</strong>
+ </dt>
+ <dd>
+ step-41, a program contributes by Jörg Frohne, shows
+ how to solve the obstacle problem. This problem describes
+ the deformation of a body subject to an inequality
+ constraint that arises from the fact that the deformation is
+ constrained by contact of the body with some external
+ obstacle. The program uses the primal-dual active set method
+ to solve this problem.
+ </dd>
+
+
<dt>
<strong style="color:red">2011/10/09: Version 7.1 released</strong>
</dt>