* information; when using discontinuous
* elements, this assumption is violated.
*
- * SOLUTION? NOT YET MADE UP!
+ * One way to get the whole thing working
+ * nonetheless would be to use a flag which
+ * tells us when the 'write' and when to
+ * 'add'. Adding is possible when we have
+ * only interior degrees of freedom, i.e.
+ * dofs that are not shared between cells.
+ * This is certainly the way to go for the
+ * DG(r) elements. However, this scheme
+ * does not work for discontinuous elements
+ * with degrees of freedom on the faces,
+ * such as the rotated bilinear
+ * (Rannacher-Turek) element or elements
+ * like the Crouzeix-Raviart one. The latter
+ * have degrees of freedom on the faces,
+ * e.g. mean values on a face, and these
+ * values are the same from both sides of
+ * the face, but the solutions are
+ * discontinuous there nevertheless, such
+ * that interpolation is not possible here.
+ *
+ * FINAL SOLUTION? NOT YET MADE UP!
*
* To compute the interpolation of a
* finite element field to a cell, you