+ 2012/04/02: step-41 solves the obstacle problem
+
+
+ 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.
+